The C109 is a short, urban route in the north west of Newcastle upon Tyne. It begins at a roundabout on the A167 Ponteland Road, just south of Kenton Bar. It sets off west from here as Etal Lane, and shortly afterwards crosses over the A1 without a junction. It continues through a roundabout and past a police station before curving round to the right and giving way at a T-junction on Trevelyan Drive. The C109 turns left here and continues along Trevelyan Drive until it ends on the C107 Newbiggin Lane.