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SouthboundCheckingLive M3 records
Live dataCheckingNational Highways NTIS
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Route information and related roads
Road details
About the M3
Approximate length58.6 miles
RouteLondon – Southampton
Northeastern endSunbury-on-Thames
Southwestern endChilworth, M27
Major areasLondon, Basingstoke, Winchester, Southampton
Key connectionsM25, M27
Connecting roads
M3 planned closures and diversions
M3 services
Motorway services guide →Selected service areas from operator listings. Check the operator for current facilities, access and opening times.
How busy is the M3?
2025 annual average140,751vehicles a day
J13 to 14 / M27 · Hampshire
9,901 HGVs a day · 7.0% of traffic
Busiest published count location · both directionsM3 route and junction details
Selected junctions and connections. Check signs for permitted movements and current access.
(M27 J4)
- Connects M27
M3 traffic questions
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Where can I find M3 services?
The services section above lists service areas on the M3.
Where are the delays on the M3?
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