The B209 is a short B-road to the west of Greenwich Park.
It starts on the A206 Greenwich High Road near the centre of Greenwich. It heads south along Royal Hill before having to TOTSO left into Hyde Vale, which is liberally sprinkled with speed humps.
At the far end of Hyde Vale is a chicane with 7' width limit (and a gate which closes a far wider gap). Immediately afterwards is a junction with the A2 Shooters Hill Road. Traffic exiting onto the A2 can only turn left but the B209 can be accessed from either direction of the main road.