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The M3 is a motorway in England that stretches from Sunbury-on-Thames, Surrey, to Eastleigh, Hampshire. Covering around 59 miles.
This route provides a key artery within the South of England. Connecting important cities and towns such as Southampton, Winchester and Basingstoke.
Originally known as the London to Basingstoke Motorway, the M3 has been in use since 1971.
The M3 is a heavily used motorway, which means it can be subject to delays and roadworks.
M3 Road Closures: Next 7 Days
Each day, we compile a list of the planned M3 road closures to help you plan your journey.
| Road number | Direction | Location | Scheduled start date | Scheduled end date | Closure details, including diversions |
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This data was provided by National Highways and was updated on this page at 06:00 on .
M3 Travel Tips
The M3 is a key motorway linking London with the South Coast, and is a popular route for commuters, and/or holidaymakers heading to the coast.
Planning ahead can help you avoid delays and make your journey easier.
- Avoid peak commuter hours. Traffic is often heaviest on weekday mornings towards London and evenings heading southbound. Particularly between Junctions 2 and 4a near the M25.
- Expect congestion around major junctions. Delays are common near the M25 interchange (J2), the A303 (J8), and around Winchester (J9). Especially during summer and holiday periods.
- Be prepared for coastal getaway traffic. Southbound traffic can build up on Fridays and during school holidays as drivers head towards the South Coast.
- Plan fuel and rest stops in advance. Fleet Services (between Junctions 4a and 5) is the main service area on the M3 and can get busy at peak times.