Basingstoke, So'ton M3
12
Heathrow Airport symbol T1-4 & Cargo, Staines M25

Change Route: M3 East or M3 West

Full free-flow intersection; also signed to Sunbury. The next section was a very early section of the M25, opened as a spur to the M3 in December 1976, at a cost of £9.9m.