The B1531 runs along a short section of the former A146 into Lowestoft. The road gained its number in the 2000s when traffic into the town centre was rerouted via the A1145.
The road starts at a roundabout on the A1117 and heads east, immediately going over a level crossing on the Ipswich to Lowestoft line. We run along the residential Victoria Road and cross a couple of mini-roundabouts. The road, which has been straight up to now, starts to bend and the road ends at a roundabout on the A12 by the side of the Inner Harbour.