The B3168 is a largely rural B-road in eastern Somerset.
It starts on the A378 at Curry Rivel. It proceeds in a southerly direction, descending slightly to cross the River Isle before going through Hambridge and Westport, where it runs parallel to the long-disused Westport Canal as far as the wharf. On the edge of Barrington the road bends sharply right and goes round Oak Hill.
The River Isle is crossed once again at the Ilford Bridges before the road bends sharply left to cross a bridge over the A303 Ilminster bypass and the River Isle for the third time before reaching a T-junction in the centre of town.
The B3168 originally ended on the A358 (A303 after 1933) in the centre of Ilminster. However, with the building of the bypass, the B3168 was extended west along the pre-bypass A303 to cross the River Isle again and end on the A303 and A358 at the Horton Cross roundabout. The former A303 east of Ilminster is now unclassified.
