This article is about the Class III road numbered C509 maintained by Sunderland Council. For other roads numbered C509, see C509.
The C509 is a short urban route in north Sunderland. It starts at a T-junction on the A1018 (former A19) in Seaburn Dene, heading south-east along Dovedale Road. It passes through a mostly residential area before meeting the B1291 at a mini roundabout. The C509 disappears here, presumably multiplexing with the B1291 south to a crossroads by the Blue Bell pub. It resumes at this junction, heading south along Fulwell Road. It runs through the somewhat dilapidated residential area of Redby, before arriving at a gyratory where Roker Baths Road heads towards the coast. The C509 however continues south on Fulwell Road to end on Roker Avenue - prior to 2019 part of the huge A1018 / A183 one way system but now, presumably, unclassified.