The A146 is a road that runs between two of East Anglia's largest population centres - Norwich in Norfolk and Lowestoft in Suffolk.

The entire route has primary classification and as such has been improved over the years, although traffic levels can lead to delays.

Before the construction of the southern bypass the A146 started in the city centre at St. Stephens Roundabout (near Norwich bus station and headed out along Bracondale and out through Trowse. However according to maps it now begins just south of the roundabout as a fork from the A11 outside the site of the old Norfolk and Norwich Hospital (which has since relocated to Colney). This first section (Ipswich Road) is actually signed as the A1056 on the ground but appears as the A146 on maps! Either way it used to be the A140, which now forms the western section of the outer ringroad. The A146/A1056 meets the A140 ringroad at traffic lights where the A140 resumes its route south to Ipswich and the A146 turns to the east to take over the southern section of the ringroad. After the Tuckswood roundabout (with McDonalds) comes another change of direction as the A146 relinquishes control of the outer ringroad to the A1054 and turns right onto a dual carriageway to bypass Trowse and leave Norwich in a south-easterly direction, which it generally maintains through the rest of its journey.