Overview
- A serious multi‑vehicle collision on the M25 clockwise between Junction 23 (South Mimms) and Junction 25 (Enfield) on Monday forced a full carriageway closure, prompted an air ambulance to land and left at least one person with a confirmed serious injury.
- National Highways said the incident is in the emergency response phase with no reopening estimate and that vehicles will be recovered and the road assessed only after casualty care is complete.
- On Sunday a woman fell from a bridge at Junction 22 on the M62; West Yorkshire Police described her injuries as serious but not life‑threatening and opened a post‑incident procedure as the motorway was closed then partially reopened.
- Multiple other collisions over the weekend and into Monday — including separate M60 crashes, a crash on the M4 Prince of Wales Bridge and incidents on the A1(M) and M1 — caused multi‑mile tailbacks, hour‑plus delays and repeated lane closures across England's motorway network.
- Drivers should expect long delays and follow National Highways diversion signs; the advised anti‑clockwise diversion from J23 uses the A1, A406 and A10 and includes a 4.7m height restriction at the A406 Railway Bridge that may affect high vehicles.