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|Distance:||126 miles (202.8 km)|
|Meets:||M1, M3, M4, M11, M20, M23, M40, A1(M), A41(M), M16|
|Former Number(s):||M20, M26|
|Route outline (key)|
Ringway 4 is the fourth ringway proposed around London, running roughly along the M26 and the M25 from Junctions 5 to the spur off 19. A number of M25 was used in the planning of the motorway.