A railway line connecting Gatwick and Heathrow airports and tunnels under the M25, , in London, are among a number of radical ideas proposed to ease congestion on one of the busiest stretches of the motorway.
Highways England, a Governmet agency conducted several studies in this respect and the proposals were put together for the Department for Transport.
Thus, the agency suggests building a 35-mile (56 kilometres) high-speed railway line between Heathrow and Gatwick.
Officials stressed that the ideas are not currently being developed, and would be examined by consultants before a shortlist is published.
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