A
controlled-access highway is a
highway designed exclusively for high-speed vehicular traffic, with all traffic flow and ingress/egress regulated. They are known by various terms worldwide, including
''Autobahn'',
''autopista'',
''autoroute'',
''autostrada'',
''autosnelweg'',
freeway,
motorway, and sometimes less precise terms such as
highway,
expressway,
parkway, or
turnpike.
A controlled-access highway provides an unhindered flow of traffic, with no traffic signals, intersections or property access. They are free of any at-grade crossings with other roads, railways, or pedestrian paths, which are instead carried by overpasses and underpasses across the highway. Entrance and exit to the highway are provided at interchanges by slip roads (ramps), which allow for speed changes between the highway and arterial thoroughfares and collector roads. On the highway, opposing directions of travel are physically separated by a central reservation (median), such as a strip of grass or boulders, or by a traffic barrier.
Controlled-access highways, as they exist today, evolved during the first half of the twentieth century. The Long Island Motor Parkway, opened in 1908 as a private venture, was the world's first limited-access roadway. Germany began to build its famous ''Reichsautobahn'' controlled-access highway network (then referred to as a ''Dual Highway'') following the First World War. It rapidly assembled a nationwide system of such roads in anticipation of their use in World War II. Italy followed shortly thereafter, opening its first ''Autostrada'' in 1925. Ontario and Pennsylvania opened the first North American ''freeways'' in 1940. Britain, heavily influenced by the railway, did not build its first ''motorway'' until the mid-1950s.
Most technologically advanced nations feature an extensive network of freeways or motorways. Many have a national-level system of route numbering. The highway has brought with it the ability to access almost any part of the world with comfort and speed, improved fuel efficiency, and improved economic and cultural access among communities.
Definition
There is no formal definition of the English-language words "motorway", "freeway" and "expressway" or of the equivalent foreign-language words ''autoroute'', ''autobahn'' ''autostrade'' that are accepted world-wide - in most cases these words are defined by local statute or design standards. Descriptions that are widely used include:
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ITE
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British Standards
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# Freeway: This is a divided major roadway with full control of access and with no crossings at grade. This definition applies to toll as well as nontoll roads.
##Freeway A: This designated roadways with greater visual complexity and high traffic volumes. Usually this type of freeway will be found in metropolitan areas in or near the central core and will operate through much of the early evening hours of darkness at or near design capacity.
##Freeway B: This designates all other divided roadways with full control of access where lighting is needed.
|''Road, specially designed and built for motor traffic, which does not serve properties bordering on it, and which:''
::''(a) is provided, except at special points or temporarily, with separate carriageways for the two directions of traffic, separated from each other, either by a dividing strip not intended for traffic, or exceptionally by other means;''
::''(b) does not cross at level with any road, railway or tramway track, or footpath;''
::''(c) is specially sign-posted as a motorway and is reserved for specific categories of road motor vehicles.''
:''Entry and exit lanes of motorways are included irrespectively of the location of the sign-posts. Urban motorways are also included.''
|
motorway Limited access ''dual carriageway road'' not crossed on the same level by other ''traffic lanes'', for the exclusive use of certain classes of motor vehicles.
|}
History
Controlled-access highways, as they exist today, evolved during the first half of the twentieth century. The
Long Island Motor Parkway, opened in 1908 as a private venture, was the world's first limited-access roadway. It included many modern features, including banked turns,
guard rails and reinforced concrete
tarmac. Modern controlled-access highways originated in the early 1920s in response to the rapidly increasing use of the
automobile, the demand for faster movement between cities and as a consequence of improvements in paving processes, techniques and materials. These original high-speed roads were referred to as "dual highways" and, while divided, bore little resemblance to the highways of today. The first dual highway in the world opened in 1924 between
Milan and
Varese and now forms parts of the
A8 and
A9 motorways. This highway, while divided, featured only one lane in each direction and no interchanges. Shortly thereafter, in 1924, the
Bronx River Parkway was opened to traffic. The Bronx River Parkway was the first road in North America to utilize a median strip to separate the opposing lanes, to be constructed through a park and where intersecting streets crossed over bridges.
Construction of the Bonn-Cologne
autobahn began in 1929 and was opened in 1932 by the mayor of Cologne.
Design
Freeways, by definition, have no at-grade
intersections with other roads,
railroads or
multi-use trails.
Movable bridges, such as the
Interstate Bridge on
Interstate 5 between
Oregon and
Washington, do require drivers to stop for
ship traffic.
The crossing of freeways by other routes is typically achieved with grade separation either in the form of underpasses or overpasses. In addition to sidewalks (footpaths) attached to roads that cross a freeway, specialized pedestrian footbridges or tunnels may also be provided. These structures enable pedestrians and cyclists to cross the freeway at that point without a detour to the nearest road crossing.
Access to freeways is typically provided only at grade-separated interchanges, though lower-standard right-in/right-out access can be used for direct connections to side roads. In many cases, sophisticated interchanges allow for smooth, uninterrupted transitions between intersecting freeways and busy arterial roads. However, sometimes it is necessary to exit onto a surface road to transfer from one freeway to another. One example in the United States (notorious for the resulting congestion) is the connection from Interstate 70 to the Pennsylvania Turnpike (Interstate 70 and Interstate 76) through the town of Breezewood, Pennsylvania.
Speed limits are generally higher on freeways and are occasionally nonexistent (as on much of Germany's Autobahn network). Because higher speeds reduce decision time, freeways are usually equipped with a larger number of guide signs than other roads, and the signs themselves are physically larger. Guide signs are often mounted on overpasses or overhead gantries so that drivers can see where each lane goes. Exit numbers are commonly derived from the exit's distance in miles or kilometers from the start of the freeway. In some areas, there are public rest areas or service areas on freeways, as well as emergency phones on the shoulder at regular intervals.
In the United States, mileposts start at the southern or westernmost point on the freeway (either its terminus or the state line). California, Ohio, and Nevada use milepost systems in which the markers indicate mileage through the state's individual counties. However, in Nevada and Ohio, and freeways that pass through Kern County, California, also use the standard milepost system concurrently with their respective postmile systems.
Cross sections
Two-lane freeways, often undivided, are sometimes built when traffic volumes are low or right-of-way is limited; they may be designed for easy conversion to one side of a four-lane freeway. Otherwise, freeways typically have at least two lanes in each direction; some busy ones can have as many as 16 or more lanes in total.
In San Diego, California, Interstate 5 has a similar system of express and local lanes for a maximum width of 21 lanes on a two-mile segment between Interstate 805 and California State Route 56. In Mississauga, Ontario, Highway 401 uses collector-express lanes for a total of 18 lanes through its intersection with 403/410 and 427.
These wide freeways may use separate collector and express lanes to separate through traffic from local traffic, or special high-occupancy vehicle lanes, either as a special restriction on the innermost lane or a separate roadway, to encourage carpooling. These HOV lanes, or roadways open to all traffic, can be reversible lanes, providing more capacity in the direction of heavy traffic, and reversing direction before traffic switches. Sometimes a collector/distributor road, a shorter version of a local lane, shifts weaving between closely spaced interchanges to a separate roadway or altogether eliminates it.
In some parts of the world, notably parts of the U.S., frontage roads form an integral part of the freeway system. These parallel surface roads provide a transition between high-speed "through" traffic and local traffic. Frequent slip-ramps provide access between the freeway and the frontage road, which in turn provides direct access to local roads and businesses.
Except on some two-lane freeways (and very rarely on wider freeways), a median separates the opposite directions of traffic. This strip may be as simple as a grassy area, or may include a crash barrier such as a "Jersey barrier" or an "Ontario Tall Wall" to prevent head-on collisions. On some freeways, the two carriageways are built on different alignments; this may be done to make use of available corridors in a mountainous area or to provide narrower corridors through dense urban areas.
Some roads in Ohio that conform to freeway criteria use at-grade intersections in lieu of over/under-passes, with occasional interchanges to avoid signalized traffic interruption (i.e., traffic lights are omitted). Examples include US 23 between OH-15's eastern terminus and Delaware, Ohio, along with Highway 15 between its eastern terminus and I-75, US-30, OH-29/US-33, and US-35 in western and central Ohio. These highways are fundamentally expressways, but expressways tend to have lower design speeds, and signalized at-grade intersections.
Control of access
Control of access is a legal status which prohibits the types of vehicles which use a highway and the points at which they can access it.
Freeways are usually limited to motor vehicles of a minimum power or weight; signs may prohibit bicyclists, pedestrians and equestrians and impose a minimum speed. It is possible for non-motorized traffic to use facilities within the same right-of-way, such as sidewalks constructed along freeway-standard bridges and multi-use paths next to freeways such as the Suncoast Trail along the Suncoast Parkway in Florida.
In some US jurisdictions, especially where freeways replace existing roads, non-motorized access on freeways is permitted. Different states of the United States have different laws. Cycling on freeways in Arizona may be prohibited only where there is an alternative route judged equal or better for cycling. Wyoming, the least populated state, allows cycling on all freeways. Oregon allows bicycles except on specific urban freeways in Portland and Medford.
In countries such as the United Kingdom and Germany, the difference between a normal road and a freeway-class road (motorway/autobahn) is the restriction of low-speed traffic. Many roads are built to freeway standards but are not legally a freeway-class road for this reason. Indeed, some freeway-class roads are downgraded for short stretches where no alternative exists, to allow low-speed traffic; examples in the UK include the Dartford Crossing (the furthest downstream public crossing of the Thames), and the former Cumberland Gap, as well as sections of the A1 not yet designated A1(M), various lengths of the A5, and the entirety of other important and near-motorway-standard links such as the A14, A34, A38, A42, A50, A55... long stretches of which carry speed limits. The reasons for such designation vary – physical lack of space (A55), restricted budget (e.g. A42 – a full-standard motorway would have been more expensive than an A-road; a motorway with additional service roads further still), to permit local access in remote areas or because of legislative or political wrangling (easier to have A-road construction or upgrade authorised and accepted than a more emotionally charged "motorway scheme", and does not require issuing of Special Road orders). Continental European non-motorway dual carriageways can have limits as high as . U.S. Route 23 in Ohio has a speed limit as high as but isn't legally a freeway-class road since it has no disclaimers saying that low-speed vehicles are prohibited; it also has at-grade intersections like expressway-class roadways.
Research shows 85 percent of motor vehicle-bicycle crashes follow turning or crossing at intersections. Freeway travel eliminates almost all those conflicts save at entrance and exit ramps – which, at least on those freeways where cycling has not been banned, have sufficient room and sight for cyclists and motorists. An analysis of crashes in Arizona showed no safety problems with cycling on freeways. Fewer than one motor vehicle-bicycle crash a year was recorded on nearly 2000 shoulder-miles open to cyclists in Arizona.
Construction techniques
The most frequent way freeways are laid out is usually by building them from the ground up after things such as forestry or buildings are cleared away. Sometimes they deplete farmland, but other methods have been developed for economic, social, and even environmental reasons.
Full freeways are sometimes made by converting at-grade expressways or by replacing at-grade intersections with overpasses; however, any at-grade intersection that ends a freeway remains. Often, when there is a two-lane undivided freeway or expressway, it is converted by constructing a twin corridor on the side by leaving a median between the two travel directions. The opposing side for the old two-way corridor becomes a passing lane.
Other techniques involve building a new carriageway on the side of a divided highway that has a lot of private access on one side and sometimes has long driveways on the other side since an easement for widening comes into place, especially in rural areas.
When a "third" carriageway is added, sometimes it can shift a directional carriageway by 50–200 ft (or maybe more depending on land availability) as a way to retain privrate access on one side that favors over the other. Other instances involve constructing a service drive that shortens the long driveways typically by less than 100 m.
Environmental effects
Controlled-access highways have been constructed both between urban centres and within them, leading to the sprawling suburban development found near most modern cities. They ideally serve to reduce travel times and accident rates, though the higher speeds have increased the severity and death rates of the collisions that do occur.
Highways have been heavily criticized by environmentalists, urbanists, and preservationists for the noise,
pollution, and economic shifts they bring.
Additionally, they have been criticized by the driving public for the inefficiency with which they handle peak hour traffic.
Often, rural highways open up vast areas to economic development and municipal services, generally raising property values. In contrast to this, above-grade highways in urban areas are often a source of lowered property values, contributing to urban decay. Even with overpasses and underpasses, neighbourhoods are divided — especially impoverished ones where residents are less likely to own a car, or to have the political and economic influence to resist construction efforts. Beginning in the early 1970s, the U.S. Congress identified freeways and other urban highways as responsible for most of the noise exposure of the U.S. population. Subsequently, computer models were developed to analyze freeway noise and aid in their design to help minimize noise exposure.
Some cities have implemented freeway removal policies in which freeways have even been demolished and reclaimed as boulevards or parks, notably in Portland (Harbor Drive), New York City (West Side Highway), Boston (Central Artery), San Francisco (Embarcadero Freeway) and Milwaukee (Park East Freeway).
An alternative to surface or above ground freeway construction has been the construction of underground urban freeways using tunnelling technologies. This has been extremely successful in the Australian cities of Sydney (which has five such freeways) and Melbourne (which has two such freeways). This has had the benefit of removing traffic from surface roads and in the case of Melbourne's Eastlink Motorway, has helped preserve an ecologically sensitive area from destruction.
Other Australian cities face similar problems (lack of available land, cost of home acquisition, aesthetic problems, and community opposition). Brisbane, which also has to contend with physical boundaries (the river) and heavy population increases, has embraced underground tunnel freeways. There are currently three under active development, one of which (the North-South Bypass Tunnel) is currently under construction. All of the planned tunnels include provisions for public transport, whether underground or in reclaimed space on the surface.
Freeway opponents have found that freeway expansion is often self-defeating: expansion simply generates more traffic. That is, even if traffic congestion is initially shifted from local streets to a new or widened freeway, people will begin to run errands and commute to more remote locations. Over time, the freeway and its environs become congested again as both the average number and distance of trips increases. This idea is known as induced demand.
Urban planning experts such as Drusilla Van Hengel, Joseph DiMento, and Sherry Ryan argue that although properly designed and maintained freeways may be convenient and safe, at least in comparison to uncontrolled roads, they may not expand recreation, employment and education opportunities equally for different ethnic groups, or for people located in certain neighborhoods of a given city. Still, they may open new markets to some small businesses.
Construction of urban freeways for the U.S. Interstate Highway System, which began in the late 1950s, led to the demolition of thousands of city blocks, and the dislocation of many more thousands of people. The citizens of many inner city areas responded with the freeway and expressway revolts. Through the study of Washington's response, it can be shown that the most effective changes came not from executive or legislative action, but instead from policy implementation. One of the foremost rationales for the creation of the U.S. Department of Transportation (DOT) was that an agency was needed to mediate between the conflicting interests of interstates and cities. Initially, these policies came as regulation of the state highway departments. Over time, DOT officials re-focused highway building from a national level to the local scale. With this shift of perspective came an encouragement for alternative transportation, and locally based planning agencies.
At present, freeway expansion has largely stalled in the United States, due to a multitude of factors that converged in the 1970s: higher due process requirements prior to taking of private property, increasing land values, increasing costs for construction materials, local opposition to new freeways in urban cores, the passage of the National Environmental Policy Act (which imposed the requirement that each new federally funded project must have an environmental impact statement or report), and falling gas tax revenues as a result of the nature of the flat-cent tax (it is not automatically adjusted for inflation), the tax revolt movement, and growing popular support for high-speed mass transit in lieu of new freeways.
Route numbering
Great Britain
In England and Wales, the numbers of major motorways followed a numbering system separate to that of the A-road network, though based on the same principle of zones. Running clockwise from the
M1 the zones were defined for Zones 1 to 4 based on the proposed
M2,
M3 and
M4 motorways. The
M5 and
M6 numbers were reserved for the other two planned long distance motorways. The
Preston Bypass, the UK's first motorway, should have been numbered A6(M) under the scheme decided upon, but it was decided to keep the number M6 as had already been applied. Certain portions or bypasses of A-roads may be designated as motorways, the name of these portions being given the suffix "(M)". An example is the
A1(M).
In Scotland, where the Scottish Office (superseded by the Scottish Government in 1999) rather than the Ministry of Transport and Civil Aviation had the decision, there is no zonal pattern, but rather the A-road rule is strictly enforced. It was decided to reserve the numbers 7, 8 and 9 for Scotland. The M8 follows the route of the A8, and the [[M85 motorway|M85
]] became part of the M90 when the A90 was re-routed along the path of the A85.
Northern Ireland
In
Northern Ireland a distinct numbering system is used, which is separate from the rest of
Ireland and from
Britain, though the classification of roads along the lines of A, B, and C is universal throughout the UK and the
Isle of Man. According to a written answer to a
parliamentary question to the
Northern Ireland Minister for Regional Development, there is no known reason as to how Northern Ireland's road numbering system was devised. However motorways, as in the rest of the UK and Ireland, are numbered M, with the two major motorways coming from
Belfast being numbered
M1 and
M2. The
M12 is a short spur of the M1 with the
M22 being a short continuation (originally intended to be a spur) of the M2. There are two other motorways, the short
M3 and a motorway section of the
A8 road, known as the
A8(M) (similar to how motorway sections of A-roads in Great Britain are numbered).
Republic of Ireland
In the
Republic of Ireland, motorway and ''national road'' numbering is quite different to the UK convention. Since the passage of the ''Roads Act 1993'', all motorways are part of, or form, ''
national primary roads''. These routes are numbered in series, (usually, radiating anti-clockwise from Dublin, starting with the N1/M1) using numbers from 1 to 33 (and, separately from the series, 50). Motorways use the number of the route of which they form part, with an M prefix rather than N for national road (or in theory, rather than R for ''regional road''). In most cases, the motorway has been built as a bypass of a road previously forming the national road (e.g. the
M7 bypassing roads previously forming the
N7) – the bypassed roads are reclassified as
regional roads, although updated signposting may not be provided for some time, and adherence to signage colour conventions is lax (regional roads have
black-on-white directional signage, national routes use white-on-green).
Under the previous legislation, the ''Local Government (Roads and Motorways) Act 1974'', motorways theoretically existed independently to national roads, however the short sections of motorway opened during this act, except for the M50, always took their number from the national road that they were bypassing. The older road was not downgraded at this point (indeed, regional roads were not legislated for at this stage). Older signage at certain junctions on the M7 and M11 can be seen reflecting this earlier scheme, where for example N11 and M11 can be seen coexisting.
The M50, an entirely new national road, is an exception to the normal inheritance process, as it does not replace a road previously carrying an N number. The M50 was nevertheless legislated in 1994 as the N50 route (it had only a short section of non-motorway section form the Junction 11 Tallaght to Junction 12 Firhouse until its extension as the Southern Cross Motorway). The M50's designation was chosen as a recognisable number. As of 2010, the N34 is the next unused national primary road designation. In theory, a motorway in Ireland could form part off ]a regional road.
Elsewhere
In
Hungary, similar to Ireland, motorway numbers can be derived from the original national highway numbers (1–7), with an M prefix attached, e.g.
M7 is on the route of the old Highway 7 from
Budapest towards
Lake Balaton and
Croatia. New motorways not following the original Budapest-centered radial highway system get numbers M8, M9, etc., or M0 in the case of the ring road around Budapest.
Also in the Netherlands, motorway numbers can be derived from the original national highway numbers, but with an A (''Autosnelweg'') prefix attached, like A9 .
In Germany motorways have the prefix A (''Autobahn''). If the following number is an odd number the motorway generally follows a North-South direction, even-numbered motorways generally follow an East-West direction
In New Zealand, as well as in the Scandinavian countries, in Finland, Brazil and Russia, motorway numbers are also derived from the state highway route that they form a part of, but unlike Hungary and Ireland, they are not distinguished from non motorway sections of the same state highway route. In the cases where a new motorway acts as a bypass of a state highway route, the original state highway is either stripped of that status or renumbered. A low road number means a road suitable for long distance driving. In Switzerland, as of April 2011, there are of a planned of motorway completed. The country is mountainous with a high proportion of tunnels, there are 220 totaling , which is over 12% of the total motorway length.
In Australia, motorway numbering varies from state to state. Currently most states are adopting numbering systems with the prefix M for motorways.
In Pakistan, motorways are denoted with the prefix M.
Regional variation
While the design characteristics listed above are generally applicable around the globe, every jurisdiction provides its own specifications and design criteria for controlled-access highways.
Australia
Most of
Australia's capital cities feature a motorway network within their urban areas.
Sydney,
Melbourne,
Brisbane and
Perth each feature freeway and motorway systems, while
Canberra,
Adelaide,
Hobart and the regional centres of
Newcastle,
Geelong,
Gold Coast, and
Wollongong feature a selection of limited-access routes. Outside these areas traffic volumes do not generally demand motorway-standard access, although heavily trafficked regional corridors such as Sydney–Newcastle (M1
Sydney–Newcastle Freeway), Brisbane–Gold Coast (M1
Pacific Motorway), Melbourne–Geelong (M1
Princes Freeway) and that form part of major long-distance routes feature high-standard motorway links.
While Sydney and Canberra (NH23 Federal Highway (Australia)) are the only two Australian capitals connected by a continuous dual-highway, upgrades to full dual-highway of the heavy-use Sydney–Melbourne (A31/M31 Hume Highway/Freeway) and Sydney–Brisbane (M1 Pacific Highway) interstate routes, a total length of more than , are underway. As of mid-2011 the NH23 was not a true controlled-access highway as many country settlements had at-level access to the highway with a large (20 m) central reservation providing a refuge for traffic that had to cross one carriageway to get to the other.
Unlike many other countries, Australia's motorways are being opened to cyclists. As the respective state governments upgrade their state's motorways bicycle lanes are being added and/or shoulders widened alongside the motorways.
Belgium
Before the 1970s, lorry drivers took long detours just to avoid Belgium. The country was at the time well known for its poor road standards. Since from the early 1970s, Belgium has built a very good motorway system. This concerns through passing motorways to and from the Netherlands, Germany, Luxembourg, France and the UK by ferries. They connect to the main cargo and ferry harbours, city ring roads, local motorways. Belgium is today has the longest total motorway length per area unit of any country in the world. Most of the motorway system has at least three lanes in each direction, and all motorways have overhead lighting, even far from towns and cities.
Brazil
Although about of Brazilian highways are motorway-standard, there is no distinct designation for controlled-access highways in the
Brazilian federal and state highway systems. As a consequence, the term ''autoestrada'' (Portuguese for "motorway") is not commonly used in Brazil; instead, most highways are referred to as ''estradas'' ("road") or ''rodovias'' ("highway").
São Paulo state, with of motorway, has the most in the country. It is also the state with more highways conceded to the private sector, resulting in the highest value of toll fares per kilometer of highway.
Rodovia dos Bandeirantes and Rodovia dos Imigrantes are examples of European-standard motorways in Brazil, having speed limits of . Other stretches of highway such as the under-construction south BR-101, Rodovia Anchieta and Rodovia Anhanguera do not meet modern European-standards but can still be considered motorways. São Paulo's under-construction beltway, Rodoanel Mário Covas, is another example of motorway, planned in order to relieve the pressure on the Marginal Tietê and Marginal Pinheiros.
China
The
National Trunk Highway System (NTHS) expressway network of the
People's Republic of China is the second longest in the world, just short of the U.S. interstate system as of 2010. The total length of China's expressways was by the end of 2011, the world's second longest only after the
United States and roughly equal to Canada,
Germany, France and Japan combined. In 2009, of expressways were added to this network.
Expressways in China are a fairly recent addition to a complicated network of roads. According to Chinese government sources, China did not have any expressways before 1988. One of the earliest expressways nationwide was the Jingshi Expressway between Beijing and Shijiazhuang in Hebei province. This expressway now forms part of the Jingzhu Expressway, currently one of the longest expressways nationwide at over .
Denmark
Denmark has a well covered motorway system today, which due to the county's geography with many islands have been difficult to build. The longest bridges are the
Great Belt and the
Øresund bridges to Skåne (
Scania) in southern Sweden. Both are motorways with dual electrical train tracks added. A motorway bridge across the
Fehmarn Belt to
Germany is planned. Around Copenhagen, two ring motorways have been built. Even roads with less than 10.000 vehicles per day have been built in the most northern part of Jutland. This was made to assure that all ferry traffic will be directed to the motorway system as soon as possible.
Germany
Germany's ''autobahn'' network has a total length of about 12,800 km, or 7,950 miles (in 2010), which ranks as the fifth-longest in the world behind the Interstate Highway System of the United States, the National Trunk Highway System (NTHS) of the People's Republic of China, the expressways of the National Highway System of Canada and the Autopistas of Spain. German autobahns have no general speed limit (though about 47% of the total length is subject to local and/or conditional limits), but the advisory speed limit ''Richtgeschwindigkeit'') is .
Great Britain
A map ''Shewing Future Pattern of Principal National Routes'' was issued by the
Ministry of War Transport in 1946 shortly before the law that allowed roads to be restricted to specified classes of vehicle (the
Special Roads Act 1949) was passed. The first section of motorway, the
M6 Preston Bypass, opened in 1958 followed by the first major section of motorway (the
M1 between
Crick and Berrygrove), which opened in 1959. From then onwards, motorways opened on a regular basis right into the 1980s; by 1972 the first of motorway had been built.
Whilst roads outside of urban areas continued to be built throughout the 1970s, opposition to urban routes became more pronounced. Most notably, plans by the Greater London Council for a series of ringways were cancelled following extensive road protests and a rise in costs. In 1986 the compromised, single-ring, M25 motorway was completed. In 1996 the total length of motorways reached .
India
Expressways in
India make up more than of the
Indian National Highway System on which they are the highest class of road. The
National Highways Development Project is underway to add an additional of expressways to the network by the year 2022.
Ireland
Northern Ireland
Legal authority existed in the
Special Roads Act (Northern Ireland) 1963 similar to that in the 1949 Act. The first motorway to open was the
M1 motorway, though it did so under temporary powers until the Special Roads Act had been passed. Work on the motorways continued until the 1970s when the
oil crisis and
The Troubles both intervened causing the abandonment of many schemes.
Republic of Ireland
In the Republic of Ireland the ''Local Government (Roads and Motorways) Act 1974'' made motorways possible, although the first section, the
M7 Naas Bypass, did not open until 1983. The first section of the
M50 opened in 1990, a part of which was Ireland's first
toll motorway, the
West-Link. However it would be the 1990s before substantial sections of motorway were opened in Ireland, with the first completed motorway – the 83 km (52 mi)
M1 motorway – being finished in 2005.
Under the Transport 21 infrastructural plan, motorways or high quality dual carriageways were built between Dublin and the major cities of Cork, Galway, Limerick and Waterford by the end of 2010. Other shorter sections of motorway either have been or will be built on some other main routes. In 2007 legislation (the ''Roads Bill 2007'') was created to allow existing roads be designated motorways by order because previously legislation allowed only for newly built roads to be designated motorways.
As a result, most HQDCs nationwide (other than some sections near Dublin on the N4 and N7, which did not fully meet motorway standards) were reclassified as motorways. The first stage in this process occurred when all the HQDC schemes open or under construction on the N7 and N8, and between Kinnegad and Athlone on the N6 and Kilcullen and south of Carlow on the N9, were reclassified motorway on 24 September 2008. Further sections of dual carriageway were reclassified in 2009.
As of December 2011, the Republic of Ireland has around 1,017 kilometres (632 mi) of motorways.
Italy
The first motorway ever built in the world was the ''
Autostrada dei laghi'', inaugurated on 21 September 1924 in
Milan. It linked Milan to
Varese; it was then extended to
Como, near the border with
Switzerland, inaugurated on 28 June 1925.
Piero Puricelli, the engineer who designed this new type of road, decided to cover the expenses by introducing a
toll.
Other motorways built before World War II in Italy were Naples-Pompeii, Florence-Pisa, Padua-Venice, Milan-Turin, Milan-Bergamo-Brescia and Rome-Ostia.
Type B highway (or strada extraurbana principale), commonly but unofficially known as superstrada, is a divided highway with at least two lanes for each direction, paved shoulder on the right, no cross-traffic and no at-grade intersections. Access restrictions on such highways are exactly the same of autostrade, as well as signage at the beginning and the end of the highway (with the only difference being the background color, blue instead of green).
Japan
make up the majority of controlled-access highways in Japan. The network boasts an uninterrupted link between
Aomori Prefecture at the northern part of
Honshū and
Kagoshima Prefecture at the southern part of
Kyūshū, linking
Shikoku as well. Additional expressways serve travellers in
Hokkaidō and on
Okinawa Island, although those are not connected to the Honshū-Kyūshū-Shikoku grid. Expressways have a combined length of 8,730 km as of March 2005.
Korea
Expressways in South Korea were originally numbered in order of construction. Since August 24, 2001, they have been numbered in a scheme somewhat similar to that of the Interstate Highway System in the United States; the icons of the South Korean highways are similar to the US red, white and blue.That's because the people who lead Korea mostly studied at USA.
Arterial routes are designated by two-digit numbers, with north-south routes having odd numbers, and east-west routes having even numbers. Primary routes (i.e. major thoroughfares) have 5 or 0 as their last digit, while secondary routes end in other digits.
Branch routes have three-digit route numbers, where the first two digits match the route number of an arterial route. This differs from the American system, whose last two digits match the primary route.
Belt lines have three-digit route numbers where the first digit matches the respective city's postal code. This also differs from American numbering.
Route numbers in the range 70–99 are not used in South Korea; they are reserved for designations in the event of Korean reunification.
The Gyeongbu Expressway kept its Route 1 designation, as it is South Korea's first and most important expressway.
New Zealand
thumb|right|300px|De Lucht Rest Area on the Dutch A2 - A typical rest area with services (fuel, refreshments and toilets). The only access is via the highway that it serves.
left|80px
The term ''Motorway'' in
New Zealand encompasses multilane divided freeways as well as narrower 2-4-lane undivided
expressways with varying degrees of
grade separation; the term ''Motorway'' describes the legal traffic restrictions rather than the type of road.
New Zealand's motorway network is small due to the nation's low population density and low traffic volumes making it uneconomical to build controlled-access highways outside the major urban centres.
New Zealand's first motorway opened in December 1950 near Wellington, running from Johnsonville to Tawa. This motorway now forms the southern part of the Johnsonville-Porirua Motorway and part of State Highway 1. Auckland's first stretch of motorway was opened in 1953 between Ellerslie and Mount Wellington (between present-day Exit 435 and Exit 438), and now forms part of the Southern Motorway.
Most major urban areas in New Zealand feature limited-access highways. Auckland, Wellington, Christchurch and Dunedin contain motorways, with only Auckland having a substantial motorway network.
Pakistan
Pakistan has a network of high-quality, international-standard limited access (or access-controlled) Motorways and Expressways, which are maintained and operated by the
National Highway Authority. Pakistan has also the largest network of Motorways in South Asia, in August 2009, operational Motorways and Expressways in Pakistan had a combined length of with another under construction and further planned.
Pakistan's motorways are part of Pakistan's National Trade Corridor project that aims to link Pakistan's three Arabian Sea ports of Karachi, Port Qasim and Gwadar to the rest of the country and further on with Afghanistan, Central Asia and China.
Pakistan's first motorway, the M2, was inaugurated in November 1997. The M2 is a long, six-lane motorway that links Pakistan's federal capital, Islamabad, with Punjab's provincial capital, Lahore. Since the completion of the M2, two additional motorways have become operational. These are the four-lane (with capacity to increase to six lanes) M3 (Pindi Bhattian-Faisalabad), which links the M2 to Faisalabad and the six-lane M1 (Peshawar-Islamabad). One additional motorway is currently under-construction, the four-lane (with capacity to increase to six lanes) M4 (Faisalabad-Multan).
Philippines
In the Philippines, there are six controlled-access highways, locally called ''tollway'' or ''expressway'', all located on the island of Luzon.
Poland
The
highways in Poland are divided into motorways and expressways. As of November 2011, there are of
motorways (''autostrady'', singular – ''autostrada'') and of
expressways (''drogi ekspresowe'', singular – ''droga ekspresowa'').
''Expressways in Poland'' are
limited-access roads which can be
dual or
single carriageways. As of January 20, 2011 there are of expressways in Poland. There are about of expressways in various stages of construction. The start of an expressway in Poland is marked with sign of white car on blue background, while number sign for an expressway is of red background and white letters, with the letter S preceding a number.
On May 15, 2004 the Regulation of the Council of Ministers (on the network of motorways and express roads) referred to a network of motorways and expressways in Poland totalling about (including about of motorways). Regulation from February 2007 added roads S2 and S79 to the list. Regulation from October 2009 supplemented plans with road S61. The following table summarizes the planned expressways in accordance with government regulations. Please note the lengths are approximate and are only indicative. As of end of January 2011 there are over of both single and dual-carriageway expressways in Poland. There are about of expressways in various stages of construction.
South Africa
In South Africa, the term ''freeway'' differs from most other parts of the world. A freeway is a road where certain restrictions apply.
The following are forbidden from using a freeway:
a vehicle drawn by an animal;
a pedal cycle (such as a bicycle);
a motor cycle having an engine with a cylinder capacity not exceeding 50 cm3 or that is propelled by electrical power;
a motor tricycle or motor quadrucycle;
pedestrians
Drivers may not use hand signals on a freeway (except in emergencies) and the minimum speed on a freeway is . Drivers in the rightmost lane of multi-carriageway freeways must move to the left if a faster vehicle approaches from behind to overtake.
Despite popular opinion that "freeway" means a road with at least two carriageways, single carriageway freeways exist, as is evidenced by the statement that "the roads include 1400 km of dual carriageway freeway, 440 km of single carriageway freeway and 5300 km of single carriage main road with unlimited access."
The Afrikaans translation of ''freeway'' is ''snelweg'' (literally ''fast road'' or ''expressway'').
Spain
With , the Spanish motorway network is the fourth largest in the world by length, after the United States, China and Canada. ''Autopistas'' are specifically reserved for automobile travel, so all vehicles not able to sustain at least are banned from them. General speed limits are mandated by the Spanish Traffic Law as . Specific limits may be imposed based on road, meteorologic or traffic conditions. Spanish legislation requires an alternate route to be provided for slower vehicles. Many, but not all, autopistas are toll roads, which also mandates an alternate toll-free route under the Spanish laws.
Thailand
The Thai motorway network is an intercity motorway network that spans . It is to be extended to over according to the master plan.
Thailand's motorway network is considered to be separate from Thailand's expressway network, which is the system of usually elevated expressways within Greater Bangkok. Thailand also has a provincial highway network.
The Thai highway network spans over across all regions of Thailand. These highways, however, are often dual carriageways with frequent u-turn lanes and intersections slowing down traffic. Coupled with the increase in the number of vehicles and the demand for a limited-access motorway, the Thai Government issued a Cabinet resolution in 1997 detailing the motorway construction master plan. Some upgraded sections of highway are being turned into a "motorway", while other motorways are being purpose-built.
United States
In the United States, a ''freeway'' is defined by the federal government's
Manual on Uniform Traffic Control Devices as a divided highway with full control of access.
This means two things. First, adjoining property owners do not have a legal right of access,
meaning that they cannot connect their lands to the highway by constructing driveways, although
frontage roads provide access to properties adjacent to a freeway in many places. When an existing road is converted into a freeway, all existing driveways must be removed and access to adjacent private lands must be blocked with fences or walls.
Second, traffic on a freeway is "free-flowing". All cross-traffic (and left-turning traffic) is relegated to overpasses or underpasses, so that there are no traffic conflicts on the main line of the highway which must be regulated by traffic lights, stop signs, or other traffic control devices. Achieving such free flow requires the construction of many overpasses, underpasses, and ramp systems. The advantage of grade-separated interchanges is that freeway drivers can almost always maintain their speed at junctions since they do not need to yield to vehicles crossing perpendicular to mainline traffic.
In contrast, an expressway is defined as a divided highway with partial control of access.
Expressways may have driveways and at-grade intersections, though these are usually less numerous than on ordinary arterial roads.
This distinction was apparently first developed in 1949 by the Special Committee on Nomenclature of what is now the American Association of State Highway and Transportation Officials.
In turn, the definitions were incorporated into AASHTO's official standards book, the Manual on Uniform Traffic Control Devices, which would become the national standards book of the U.S. Department of Transportation under a 1966 federal statute. The same distinction has also been codified into the statutory law of eight states: California, Minnesota, Mississippi, Missouri, Nebraska, North Dakota, Ohio, and Wisconsin.
However, each state codified the federal distinction slightly differently. California expressways do not necessarily have to be divided, though they must have at least partial access control. For both terms to apply, in Wisconsin, a divided highway must be at least four lanes wide; and in Missouri, both terms apply only to divided highways at least long that are not part of the Interstate Highway System. In North Dakota and Mississippi, expressways may have "full or partial" access control and "generally" have grade separations at intersections; a freeway is then defined as an expressway with full access control. Ohio's statute is similar, but instead of the vague word ''generally'', it imposes a requirement that 50% of an expressway's intersections must be grade-separated for the term to apply.
Only Minnesota enacted the exact MUTCD definitions, in May 2008.
The term ''expressway'' is also used for what the federal government calls "freeways"; Where the terms are distinguished, freeways can be characterized as expressways upgraded to full access control, while not all expressways are freeways.
Examples in the United States of roads which are technically expressways (under the federal definition), but contain the word "freeway" in their names: State Fair Freeway in Kansas, Chino Valley Freeway, Rockaway Freeway in New York, and Shenango Valley Freeway (a portion of U.S. Route 62) in Pennsylvania.
Unlike some countries, not all freeways in the U.S. are part of a single national freeway network (although together with non-freeways, they form the National Highway System). For example, many state highways such as California State Route 99 have significant freeway sections. Many sections of the older United States Numbered Highways network have been upgraded to freeways but have kept their existing U.S. Highway numbers.
See also
List of controlled access highway systems
List of OECD countries by road network size
References
Category:Types of roads
als:Autobahn
ar:طريق سيار
az:Avtomagistral
be:Аўтамагістраль
bg:Автомагистрала
bs:Autoput
ca:Autopista
cv:Автомобиль çулĕ
cs:Dálnice
cy:Traffordd
da:Motorvej
de:Autobahn
et:Maantee
el:Αυτοκινητόδρομος
eml:Autostrè
es:Autopista
eo:Aŭtovojo
ext:Autopista
eu:Autobide
fa:آزادراه
fr:Autoroute
fy:Autodyk
ga:Mótarbhealach
gl:Autoestrada
ko:고속도로
hr:Autocesta
id:Jalan bebas hambatan terkendali
it:Autostrada
he:כביש מהיר
ka:ავტოსტრადა
la:Autovia
lv:Automaģistrāle
lb:Autobunn
lt:Automagistralė
hu:Autópálya
ms:Lebuh raya
nl:Autosnelweg
ja:高速道路
nap:Autostrada
no:Motorvei
nn:Motorveg
nrm:Motoroute
oc:Autorota
pms:Autostrà
pl:Autostrada
pt:Autoestrada
ro:Autostradă
ru:Автомагистраль
sco:Motorwey
sq:Autoudhë
simple:Motorway
sk:Diaľnica
sl:Avtocesta
szl:Autobana
sr:Ауто-пут
sh:Autoput
fi:Moottoritie
sv:Motorväg
th:ทางหลวงพิเศษ
tr:Otoyol
uk:Автомагістраль
wa:Otostråde
zh:高速公路