This article is about the Class III road numbered C30 maintained by Falkirk Council. For other roads numbered C30, see C30.
The route of the C30 is not entirely clear. One reference lists it as connecting the A9 and A803, whilst another states that part of Salmon Inn Road in Polmont is part of the C30. By linking these two together, we can postulate that the route starts on the A9 a little west of Cadgers Brae Roundabout, heads south along Grandsable Road (formerly the A905, then crosses the A803 and follows Salmon Inn Road through to the B810 near Polmont Station. This clearly doesn't quite fit the available information, but is the best guess at present.