The A5 in Milton Keynes is CLOSED northbound and southbound between the A422 and the A508.
National Highways reports the serious collision includes a vehicle and a pedestrian.
It was first recorded at 5am this morning and the road remains closed.
A diversion is in place with traffic advised to follow the hollow square diversion symbol on road signs.
Accident investigation work is currently taking place.
⚠ ROAD CLOSURE⚠
— TVP Milton Keynes (@tvp_mk) February 5, 2022
The A5 is closed northbound from the Abbey Hill Roundabout to the Old Stratford Roundabout due to a road traffic collision.
Please avoid the area and find alternative routes. pic.twitter.com/OSS11WTZ4i
14:20PM- A5 reopens