Runnymede Interchange

The Runnymede Interchange is at the point the M25 crosses the River Thames (the crossing of the London Orbital on the east side, at Dartford, is on the A282). The A30 Staines bypass also crosses the River Thames here.

The interchange has two parts: the southern roundabout is called Runnymede Roundabout, while the northern roundabout interchange is unnamed, but forms junction 13 of the M25.

The junction is the northern/western access to Thorpe Park from the M25, with traffic directed via the A308 and A320 to Chertsey.

History

1994 proposals

The interchange first opened in 1961 when the A30 crossed the Thames on the original interchange. In 1983, a new bridge opened for the anti-clockwise M25 and the A30 slips therefore the original bridge is now used for the Clockwise M25 and eastbound A30. The B376 & B388 also have spurs linking the interchange for local traffic.

Proposals to widen the M25 in 1994 by means of adding C/D roads would have altered the junction. All movements between the north and south roundabouts would be to the east of the M25. The northern roundabout would be widened on its eastern side to accommodate the extra arm. This scheme was abandoned a few years later in favour of conventional widening so no alterations were made to the junction.

Strip Maps

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  The current layout of the interchange.

Routes

Route	To	Notes
M25	(M4, M40, M1), Heathrow Airport, Watford
M25	(M3, M23, M20), Southampton, Gatwick Airport, Dartford
A30	London (W), Hounslow, Staines, Kingston upon Thames (A308)
A30	Basingstoke, Camberley, Royal Holloway University of London, Savill Garden, Sunningdale, Bagshot
A308	Windsor, Runneymede Memorials, Legoland
A308	Chertsey (A320)
B376	Wraysbury
B388	Egham Town Centre, Shopping Centre, Parking 500 spaces	no road number shown