The M2 Junction 5/A249 Stockbury Roundabout is the main access point for people travelling northeast to Sittingbourne, the Isle of Sheppey and the Port of Sheerness and southwest to Maidstone and surrounding villages.
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.
One would run outside north London, to be called the M16, and one around south London, the original M25. Plans developed into a single ring motorway, now just called the M25, and work began in 1975.