This article is about the Class III road numbered C157 maintained by DfI Roads. For other roads numbered C157, see C157.
The C157 forms two very separate stretches of road. The first stretch starts on the B2 in Derrymacash and heads south west as far as a sharp right hand turn on a junction with the dead end Carbet Road north of Craigavon. The road resumes on the opposite side of Craigavon, southwards from a roundabout on the A27. On the edge of the town the road turns off to the south to meet a spur of the B2 extending as far as the south western edge of Craigavon.