The Dartford - Thurrock River Crossing, Dartford River Crossing (DRC) (or simply the Dartford Crossing) is a major road crossing of the River Thames in England, connecting Dartford in the south to Thurrock in the north, via two road tunnels and the Queen Elizabeth II Bridge. It opened in stages, the west tunnel in 1963, the east tunnel in 1980, and the bridge in 1991. Until the opening of the bridge, built to the east of the two tunnels, the crossing was known as the Dartford Tunnel.
The two tunnels are 1,430 m (1,560 yd) long, while the cable-stayed bridge is 137 metres (449 ft) high with a main span of 450 metres (490 yd). The crossing carries nearly 150,000 vehicles a day and forms part of London's orbital route, the M25—although the crossing and its approach road are actually the A282, allowing traffic prohibited from motorways to use the crossing. Southbound traffic crosses the four lane bridge; northbound traffic uses both of the two lane road tunnels. However, in bad weather or high winds, the bridge is closed and the crossing reverts to using the tunnels for both directions.
Coordinates: 51°27′50″N 0°15′14″E / 51.464°N 0.254°E / 51.464; 0.254
Dartford is the principal town in the borough of Dartford. It is situated in the northwest corner of Kent, England, 16 miles (26 km) east south-east of central London.
The town centre is situated in a valley through which the River Darent flows, and where the old road from London to Dover crossed: hence the name, from Darent + ford. Dartford became a market town in medieval times and, although today it is principally a commuter town for Greater London, it has a long history of religious, industrial and cultural importance. It is an important rail hub; the main through-road now avoids the town itself.
In prehistory, the first people appeared in the Dartford area around 250,000 years ago: a tribe of prehistoric hunter-gatherers whose exemplar is called Swanscombe Man. Many other archaeological investigations have revealed a good picture of occupation of the district with important finds from the Stone Age, the Bronze Age and the Iron Age.