The A1137 is one of two cross-town routes in the Lincolnshire town of Boston, the other being the main A52.
The road starts at a roundabout at the eastern end of the town centre relief road, where the A16 (which here is the dominant number in a multiplex with the A52) bears eastwards to cross a drain whilst we continue north alongside it on Horncastle Road. There is a set of traffic lights by the first bridge (a footbridge) and we TOTSO left with the B1183 continuing ahead.
Grand Sluice in Boston, which carries the A1137
We now head west along Norfolk Street, which soon goes through an industrial estate but is otherwise residential. After passing Central Park we reach a signalised T-junction and TOTSO right, which then bears left to cross the Grand Sluice over the River Witham. There is a level crossing over the single-track Boston to Skegness railway line immediately afterwards. We go straight ahead at the next set of traffic lights, which serves an Asda and which is the quickest way to get to the A52 from here.
We continue along Fydell Street, which turns into Argyle Street to reach a mini-roundabout on Brothertoft Road. We bear left here to head south and soon reach the A52 Sleaford Road at traffic lights.
On classification in 1922 Horncastle Road was numbered B1183 whilst the remainder of what is now the A1137 was unclassified. It was soon classified, however, gaining the B1393 number in the mid-1920s.
This situation lasted until the 1970s when the A1137 came into being. The B1183 was truncated slightly as the A-road took over its southern end, whilst the B1393 disappeared completely.