M25 westbound heading south on A3: Drivers heading westbound on the M25 and wanting to head south on the A3 should leave the motorway at Junction 9, taking the first exit and following the A24 ...

turn right onto the A24 (A240) Kingston. Continue for 3 miles and turn left onto the A3 Portsmouth, Guildford. Continue for 9½ miles to the M25 and re-join the motorway at junction 10.