M25 Hertfordshire, anti-clockwise between A412 [M25 junction 17] and M40 [M25 junction 16]
M25 Hertfordshire - M25 closed and long delays anticlockwise between J17, A412 (Maple Cross) and J16 M40, because of accident investigation work. Diversion in operation - via the A412, A40 and M40 following the ‘Hollow Square’ symbol signs. Delays on the A412 diversion route. Traffic is also very slow on the A406 North Circular in North-West London from the M1 to the A40. Travel time is about 60 minutes. Congestion to J19, M25 (Watford).
Looks like it will be shut a good while