M3 Junction 2 — the M25 Interchange
Junction 2 is where the M3 meets the M25 at its own Junction 12, and it is the busiest decision point on the motorway. Nearly half of everything on the M3 at this point is heading for the M25 rather than continuing north to Sunbury.
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Latest accident or incident on the M3
The most recent accident or incident on the M3 that we are aware of.
M3 Eastbound Jct 2 to Jct 1 carriageway closure
00:462 Sept 2026reported 10 min ago
- Location
- M3 eastbound between J2 and J1
- Direction
- Eastbound
- Lanes closed
- Carriageway closed
- Reason
- Other
- Schedule
- 22:00 Tue 1 Sept → 05:30 Wed 2 Sept
Latest active roadworks on the M3
Roadworks live on the M3 right now.
A303 eastbound crematorium to M3 carriageway closure
00:462 Sept 2026reported 10 min ago
- Location
- M3 eastbound between J8 and J7
- Direction
- Eastbound
- Lanes closed
- Carriageway closed
- Reason
- Roadworks
- Schedule
- 20:54 Tue 1 Sept → 06:00 Wed 2 Sept
+ 1 more active roadworks - search all M3 traffic news →
Latest planned roadworks on the M3
The next planned roadworks scheduled on the M3.
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Updated 00:57 Wed 2 Sept
Powered by National Highways’ Transport Data Feeds.
How busy is the M3 at Junction 2?
The Department for Transport counts traffic either side of the M25 interchange. These are the 2025 figures.
| Stretch | Length | Vehicles per day |
|---|---|---|
| Approaching the M25 (Kitsmead Lane flyover to M25 J12) | 2.1 miles | 113,905 |
| Beyond the M25, J2 to J1 Sunbury (estimated) | 5.8 miles | 62,848 |
The gap between those two figures is the interchange itself: around 51,000 vehicles a day — about 45% of the traffic — join or leave the M3 at the M25. It is the single biggest exchange of traffic anywhere on the motorway.
The approach to the M25 is also noticeably one-sided: 60,584 vehicles a day westbound against 53,321 eastbound, a 14% difference. Lorries make up 7,713 a day, or 6.8% of the traffic.
The J2–J1 figure is marked Estimated by the Department for Transport rather than counted, so treat it as an indication rather than a measurement. Every other figure on this page is from a physical count.