Thorpe Interchange

Thorpe Interchange is a turbine-configured junction in Runnymede that connects the M25 and M3 motorways through curved ramps allowing continuous vehicle movement. The design features five lanes northbound and four lanes southbound on the M25, enabling drivers to switch between the two major routes without stopping.

Construction began in July 1978 and was officially opened on October 9, 1980. The project emerged as part of broader efforts to improve transport links in the region southwest of London.

The interchange reflects modern British road engineering and was designed without traffic signals to enable safe, continuous driving between two major motorways. The structure shows how technical solutions can balance safety with efficient movement of vehicles.

The two motorways are connected by smooth curves that make navigating easier for drivers, especially those unfamiliar with the route. Signs are positioned clearly to point toward exits early, giving drivers plenty of time to position themselves in the correct lane.

The turbine design is a rare British engineering achievement that connects four different directions of travel without a single traffic light. This configuration was chosen because it ensures constant traffic flow and eliminates delays from red lights.

Location: Runnymede

Official opening: October 9, 1980

Part of: M25 motorway, M3 motorway

GPS coordinates: 51.40076,-0.53746

Latest update: December 12, 2025 14:27