Back Traffordd yr M3 Welsh M3 motorway German M3 motorway (Great Britain) English آزادراه ام۳ (بریتانیا) Persian Autoroute M3 (Grande-Bretagne) French Motorway M3 Italian Autostrada M3 (Gran Bretagna) LMO M3 (Groot-Brittannië) Dutch M3 (Storbritannien) Swedish Автомагістраль М3 (Велика Британія) Ukrainian
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&sq=Envato&lang=simple&file=File:M3_motorway_(Great_Britain)_map.svg) | ||||
&sq=Envato&lang=simple&file=File:Twyford_down_cutting_03.jpg) Looking south at Twyford Down | ||||
| Route information | ||||
Part of  | ||||
| Maintained by Highways England | ||||
| Length | 58.6 mi (94.3 km) | |||
| Existed | 1971–present | |||
| History | Opened: 1971 Completed: 1995 | |||
| Major junctions | ||||
| Northeast end | Sunbury-on-Thames 51°25′00″N 0°25′26″W / 51.4166°N 0.4240°W | |||
&sq=Envato&lang=simple&file=File:Junction_2.svg){kind=small} &sq=Envato&lang=simple&file=File:UK-Motorway-M25.svg){kind=small} J2 → M25 motorway &sq=Envato&lang=simple&file=File:Junction_14.svg){kind=small} &sq=Envato&lang=simple&file=File:UK-Motorway-M27.svg){kind=small} J14 → M27 motorway | ||||
| Southwest end | Chilworth 50°57′16″N 1°24′29″W / 50.9545°N 1.4081°W | |||
| Location | ||||
| Country | United Kingdom | |||
| Counties | Surrey, Hampshire | |||
| Primary destinations | Basingstoke Winchester Southampton | |||
| Road network | ||||
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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.