This article is about the Class III road numbered C15 maintained by DfI Roads.
For other roads numbered C15, see C15
The C15 starts and finishes on the A30 between Ballycarrickmaddy and Glenavy. In terms of driving distance it is actually a marginally shorter route between its two ends than going via the A30, but the road is generally a single track. Starting at Ballycarrickmaddy, the road heads north west and soon crosses the C13 via a slightly scattered crossroads. The road continues on a broadly north western direction for a few more kilometres before coming to an end on the A30 just outside Glenavy, the same road it started on to the south east.