Traffic was backed up on the M25 anti-clockwise in Essex due to a collision which closed three lanes between J28 (for the A12, near Brentwood) and J27 (for the M11, near Epping).
National Highways said there were delays of at least an hour and a half.
It said: “All emergency services including Essex Police are in attendance. National Highways Traffic Officers are also on scene providing assistance with traffic management.
If this closure impacts on your planned route, please allow extra journey time as there is over 8 miles of congestion on approach. Plan ahead, you may wish to re-route or even delay your journey.”
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