The B275 is a relatively short B-road to the south of Croydon. Originally unclassified, the road gained its number in the early 1930s.
The route starts at Fiveways Corner in Waddon, just south west of Croydon town centre. This is also the junction of the A23, A232 and B271. The B275 has its own phase at these lights. The road heads east through suburban estates and across a mini roundabout to reach the A235 Brighton Road at a traffic signal. Across the lights the road is one-way eastbound (and shown on some maps as a spur of the A235) and westbound traffic has to divert to the other side of the Swan and Sugar Loaf pub and follow a short multiplex with the A235.
Turning south at another mini-roundabout (the junction with the B274 and B243), the road soon passes under two railway lines: the main line to Brighton and the East Grinstead Line. Presently the road becomes semi-rural. There are still houses on the right but they become larger whilst on the left they are replaced with a wood and a golf course behind it. Climbing onto the North Downs it is not too far until the end of the road is reached at a T-junction on the A2022. Immediately opposite is the driveway of the Selsdon Park Hotel.
In the 1960s the B275 took a slightly different route, starting further north on St Johns Road and following both Waddon Road and Old Town south east along what is now the A236 before picking up the current route on Selsdon Road. The rest of the route appears to be unchanged.