The M25 in Essex has been closed anti-clockwise between J28 (for the A12, near Brentwood) and J27 (for the M11, near Epping) due to a serious collision that happened on Monday morning, National Highways said.
The incident occurred before junction 27, for the M11.
As a result of the incident and closure, traffic is building up, with traffic reporting system INRIX speaking of a four-mile queue.
Drivers are urged to avoid the area where possible, and National Highways has put a diversion in place.
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