M3 motorway (Great Britain)

M3 shield
M3
Twyford down cutting 03.jpg
Looking south at Twyford Down
Route information
Part of
Maintained by Highways England
Length58.6 mi (94.3 km)
Existed1971–present
HistoryOpened: 1971
Completed: 1995
Major junctions
Northeast endSunbury-on-Thames
51°25′00″N 0°25′26″W / 51.4166°N 0.4240°W / 51.4166; -0.4240 (M3 motorway (northeastern end))
Major intersections
J2 → M25 motorway

J14 → M27 motorway
Southwest endChilworth
50°57′16″N 1°24′29″W / 50.9545°N 1.4081°W / 50.9545; -1.4081 (M3 motorway (southwestern end))
Location
CountryUnited Kingdom
CountiesSurrey, Hampshire
Primary
destinations
Basingstoke
Winchester
Southampton
Road network
M2M4

The M3 is a motorway between Sunbury-on-Thames and Southampton in England. It links London with Southampton and Portsmouth, as well as South West England. It is about 59 miles (95 km) long.


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