Temporary speed limits in force on the M3. No closures right now.
The M3 is running normally. Nothing is reported in the National Highways feed right now.
Updated at 07:17 · refreshes every 5 min
No. Nothing unplanned is reported on the M3 right now: no collisions, breakdowns or obstructions in the National Highways feed. Nothing unplanned has been reported and cleared on the M3 since midnight either.
M3 accidents →The M3 stays open tonight, but 4 lane or slip road closures are planned, so expect narrower lanes or a shut slip at those junctions.
M3 closures tonight →No. Nothing is planned to close on the M3 this weekend.
M3 closures this weekend →No closures, collisions or restrictions in the feed right now. Planned works for the days ahead are below.
M3 westbound between J4A and J5
M3 eastbound between J4A and J4
M3 J4A eastbound access
M3 J4A eastbound exit
Powered by National Highways’ Transport Data Feeds
The M3 is busiest around 17:00, and at the sensors along this route it keeps moving: even in that hour traffic averages 58.7 mph.
Typical weekday pattern from 5 National Highways roadside sensors along the route, June 2026. Bar height is traffic volume, colour is average speed. Overnight hours carry too little traffic to judge, so they are shown as quiet.
Junction data © OpenStreetMap contributors
The M3 runs from the M25 at Thorpe down past Basingstoke and Winchester to the M27 for Southampton and the south coast. The smart-motorway section between J2 and J4a carries the heaviest flows, and summer Saturdays add south-coast holiday traffic to the usual commuter pattern. Live incidents, roadworks and closures refresh every 5 minutes.