London Heathrow: Improved 14-lane M25 with Expansion

A third runway at Heathrow provides an opportunity to improve one of the most congested sections of the M25.

Our proposals will require a new, tunnelled section.

The tunnel will be constructed alongside the existing route and minimise disruption to existing users of the motorway.

Once built, new collector/distributor roads will run parallel to the motorway which will segregate airport and local traffic from the main carriageway, adding capacity to the M25.

Separating traffic will reduce the weaving of cars from lane to lane and smooth the traffic flow for non-airport M25 traffic.

Having listened to public feedback, we have also revised our proposals to avoid changes to the M25/M4 interchange.

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