The B237 is a short B-road in the London Borough of Wandsworth. The road was originally unclassified but presumably gained its number in the mid-1920s.
The road starts at traffic lights on the A214 Trinity Road, where the unclassified Upper Tooting Park also joins on the same side. The B237 heads northwards along the dead-straight, residential St James's Drive and soon reaches a corner of Wandsworth Common, which it skirts as far as traffic lights on the B229, which are met just after the access road to Wandsworth Common station.
The B237 TOTSOs right here and is apparently the dominant number in a multiplex with the B229 (that number was here first so the number must have been changed at some time unknown). We cross this corner of the Common and go over the railway line before the B229 turns left at traffic lights and the B237 continues ahead, now fully residential once more. We continue east along Nightingale Lane, which has a few bends unlike the grid-pattern streets surrounding it. It's not long before the next common, Clapham Common, is reached. We run along its south side and end at traffic lights on the A24 adjacent to Clapham South station.