This article is about the Class III road numbered C305 maintained by DfI Roads. For other roads numbered C305, see C305.
The C305 starts on the B178 south of Ravernet. The road heads north through Ravernet and across the Ravernet River before passing under the M1 near Sprucefield. A short spur continues ahead towards the A1, while the remainder of the route turns off north east into Lisburn along Hillsborough Old Road. The road ends at a TOTSO on the C297 just before the latter's junction with the A49.