The route starts at traffic lights on the A232 Cheam High Street. It heads north along the residential Malden Road and presently reaches the next district centre, North Cheam, where it crosses the A24 at traffic lights.
Continuing north through the suburbs the road passes between two churches before zigzagging onto Central Road, the main street in Worcester Park. Another zigzag at the far end takes us onto a short dualled section under the Mole Valley Line by Worcester Park station; this is also where we cross the London borough boundary. The road narrows again for us to meet the B284 just before going under the Chessington Branch Line. After bending sharply to the right the road heads due north to cross the A3 Kingston Bypass at a roundabout GSJ.
The next roundabout is in New Malden and is where the A2043 turns left. It runs northwestwards along the dead-straight Kingston Road to go under yet another railway bridge, carrying the South Western Main Line. The Kingsmeadow stadium is passed before the road passes into the Kingston suburb of Norbiton. It bends to the right to end at traffic lights on the A308.