The crossing, although not officially designated a motorway, is considered part of the M25 motorway's route, using the tunnels northbound and bridge southbound.
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To the east of London the two ends of the M25 are joined to complete a loop by the non-motorway A282 Dartford Crossing of the River Thames between Thurrock and Dartford. The crossing consists of twin two-lane tunnels and the four-lane QE2 (Queen Elizabeth II) bridge, with a main span of 450 metres (1,480 ft).
Answer. Answer: A motorway just relates to the A road that it's relieving pressure from. The reason there is no M7 is that the A7, which runs from Carlisle to Edinburgh has no need for a motorway to relieve it.
The issue at hand is a simple one. Between junctions 10 and 11 on the M25, the surface of the motorway consists of concrete blocks. The concrete surface itself is noisy, and there are gaps between each of the concrete blocks that constitute the road.