Editing Heathrow Airport (section)

===Car===
Heathrow is accessible via the nearby [[M4 motorway]] or [[A4 road (Great Britain)|A4 road]] (Terminals 2–3), the [[M25 motorway]] (Terminals 4 and 5) and the [[A30 road]] (Terminal 4). There are drop-off and pick-up areas at all terminals and short-<ref>{{cite web|url=https://www.heathrow.com/transport-and-directions/heathrow-parking/heathrow-short-stay-parking|title=Heathrow Short Stay Parking|publisher=Heathrow Airport|access-date=23 March 2018|archive-url=https://web.archive.org/web/20180324101931/https://www.heathrow.com/transport-and-directions/heathrow-parking/heathrow-short-stay-parking|archive-date=24 March 2018|url-status=live}}</ref> and long-stay<ref>{{cite web|url=https://www.heathrow.com/transport-and-directions/heathrow-parking/heathrow-long-stay-parking|title=Heathrow Long Stay Parking|publisher=Heathrow Airport|access-date=23 March 2018|archive-url=https://web.archive.org/web/20180324102202/https://www.heathrow.com/transport-and-directions/heathrow-parking/heathrow-long-stay-parking|archive-date=24 March 2018|url-status=live}}</ref> multi-storey car parks. All the Heathrow forecourts are drop-off only.<ref name=":0">{{cite web|title=Heathrow parking picking up and dropping off information|url=https://www.heathrow.com/transport-and-directions/heathrow-parking|website=www.heathrow.com|access-date=23 March 2018|archive-url=https://web.archive.org/web/20180324102402/https://www.heathrow.com/transport-and-directions/heathrow-parking|archive-date=24 March 2018|url-status=live}}</ref> There are further car parks, not run by Heathrow Airport Holdings, just outside the airport: the most recognisable is the [[National Car Parks]] facility, although there are many other options; these car parks are connected to the terminals by shuttle buses.

Four parallel tunnels under the northern runway connect the M4 Heathrow spur and the A4 road to Terminals 2–3. The two larger tunnels are each two lanes wide and are used for motorised traffic. The two smaller tunnels were originally reserved for pedestrians and bicycles; to increase traffic capacity the cycle lanes have been modified to each take a single lane of cars, although bicycles still have priority over cars.{{cn|date=January 2025}} Pedestrian access to the smaller tunnels has been discontinued, with the free bus services being used instead.