The A3113 is a short road which connects the M25 to Heathrow Airport. It is signposted for Terminals 4 and 5 and Cargo, although traffic for Terminal 5 is also directed along the M25 spur just to the north.
The road begins at J14 of the M25, from where it heads eastwards, being D2 and primary for its entire, very short length. The road crosses an unclassified road severed when it was built; there is an underpass for pedestrians but vehicles must join the A3113 to the east and U-turn at the roundabout, making the road now essentially one-way southbound; there is no corresponding northbound movement or west-facing access.
The road soon terminates on a roundabout with the non-primary A3044, which runs alongside the perimeter fence. The airport's Southern Perimeter Road is just ahead. Although the A3113 does run right next to one of the world's busiest airports it doesn't really feel that way if you ignore all the aeroplanes.
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