Heathrow runway to be built over the top of the M25

Of the three options for expansion presented by Heathrow Airport Ltd in the summer, the Airports Commission is only progressing one of them: the plans for a new runway to the north west of the existing airport.

The other Heathrow idea being investigated by the Commission comes from a pressure group called Heathrow Hub: the extension of one of the current runways.

Read: New runways considered at Gatwick and Heathrow

The proposal is to build a third runway to the north west of the existing airport. It is a different proposal to the one approved by Gordon Brown when he was Prime Minister.

More: Heathrow expansion means disruption for local villages

The new runway would be the north west of the current airport, meaning it would have to go over the motorway. Credit: Heathrow Airport.

The new runway is further to the west - and anyone who knows this area will work out it brings the runway of Britain's busiest airport into conflict with Britain's busiest motorway, the M25. Look at the plan and you will see the runway is built over the top of the motorway.

That is not unusual. At Paris' Charles de Gaulle airport, a motorway passes under one of the runways in a tunnel. But it does mean this option is not cheap.

Read more: Report signals Heathrow status quo no longer an option

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Heathrow and Gatwick shortlisted for expansion

Expansion of Heathrow and Gatwick are the shortlisted options being considered by a government-backed commission into airport expansion. In its interim report, the commission also says a new airport will be needed in the South East by 2030.