Junctions
Data from driver location signs are used to provide distance and carriageway identification information.
| M3 motorway junctions | ||||
| km | m | Northeastbound exits (B Carriageway) | Junction | Southwestbound exits (A Carriageway) |
| 24.2 | 15.0 | Road continues as A316 to London | J1 | Sunbury, Kingston A308 Non-motorway traffic |
| 24.6 | 15.3 | Sunbury, Kingston A308 | Start of motorway | |
| 34.2 | 21.3 | Gatwick (M23), Maidstone (M20), Stansted (M11), The North (M1), Heathrow (M4), Chertsey (A320), Staines (A30) M25 | J2 | Gatwick (M23), Maidstone (M20), Stansted (M11), The North (M1), Heathrow (M4), Chertsey (A320), Staines (A30) M25 |
| 45.2 | 28.1 | Woking, Bracknell, Bagshot, Lightwater A322 | J3 | Woking, Bracknell, Bagshot, Lightwater A322 |
| 52.5 | 32.6 | Guildford, Farnham, Camberley, Farnborough, Aldershot A331 | J4 | Guildford, Farnham, Camberley, Farnborough, Aldershot A331 |
| 55.4 | 34.4 | Farnborough (West) A327 Fleet (A3013) |
J4a | Farnborough (West) A327 Fleet (A3013) |
| Fleet services | Services | Fleet services | ||
| 67.4 | 41.9 | Hook A287 B3349 | J5 | Hook A287 B3349 |
| 75.0 | 46.6 | Basingstoke, Newbury, Alton A339 Reading (A33) |
J6 | Basingstoke, Newbury, Alton A339 |
| 83.3 | 51.8 | Basingstoke A30 | J7 | Basingstoke A30 |
| 85.5 | 53.1 | No access | J8 | The South West, Andover, Salisbury A303 |
| 96.4 | 59.9 | Winchester services | Services | Winchester services |
| 102.8 | 63.9 | The Midlands, Newbury A34 Winchester A272 |
J9 | The Midlands, Newbury A34 Winchester A272 |
| 105.0 | 65.2 | Winchester (City) B3330 Alton A31 |
J10 | No access |
| 108.1 | 67.2 | Winchester A3090 Twyford B3335 |
J11 | Winchester A3090 Twyford B3335 |
| 112.6 | 70.0 | Eastleigh (North) A335 | J12 | Eastleigh (North), Chandler's Ford A335 |
| 115.6 | 71.8 | Eastleigh, Chandler's Ford A335 | J13 | Eastleigh A335 |
| Start of motorway | J14 | Southampton, Portsmouth M27(E) The West, Southampton Docks, Bournemouth M27(W) Southampton A33 |
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Read more about this topic: M3 Motorway (Great Britain)