This article is about the Class III road numbered C255 maintained by DfI Roads.
For other roads numbered C255, see C255
The C255 starts on the A2 in Millisle, on the east coast of the Ards Peninsula. From here the road heads south westward inland, passing the eastern end of the C254 on its way to Carrowdore. At the far end of Carrowdore, the road passes the C252 and comes to a scattered crossroads on the C256. South of the crossroads, the road encounters a TOTSO from which it turns south towards Greyabbey. Here the road ends on yet another TOTSO, this time on the B5.