|From:||North Ferriby (SE977264)|
|Distance:||6.2 miles (10 km)|
|Meets:||A63, A164, B1232, A1105|
|Former Number(s):||A63, A164|
|Route outline (key)|
The B1231 is a Class II route into Hull from the west.
It starts at the western end of the North Ferriby bypass and heads east along the pre-bypass A63 into the centre of town before having to TOTSO left at its original starting point. It crosses the A63 bypass with no junction before passing through Swanland, where it has to TOTSO right.
Now heading east, the B1231 crosses the A164 at a roundabout just to the north of the Humber Bridge before reaching the B1232 in South Ella. This was the original eastern end of the B1231 but in 1984 it was extended east, following a brief multiplex north along the B1232, along some of the pre-bypass A164 as far as the A1105 on the western edge of Hull.