Construction work to convert parts of the A1(M) into a smart motorway in Hertfordshire has been put on hold until a government review is complete.
A crash on the southbound stretch of the A1(M) is causing heavy traffic this evening.
Two vehicles collided on the A1(M) southbound between Stevenage and Welwyn this morning, causing serious traffic delays for commuters in both directions.
One lane of the A1(M) has been closed after a crash between the Stevenage and Letchworth Gate junctions this evening - with heavy traffic back to Welwyn.
A 35-year-old man was arrested on suspicion of dangerous driving last night after a car crashed in the Hatfield Tunnel, blocking a lane of the A1(M).
There are long delays on the A1(M) near Stevenage this morning after a crash on the southbound carriageway.
There has been a crash on the A1(M) between junctions 6 and 7 this evening, causing long delays in the area.
The eastbound A414 is closed and two lanes are blocked on the connecting A1(M) roundabout at Junction 4 for Hatfield after a HGV overturned this afternoon.
The A1(M) northbound carriageway between Welwyn and Stevenage has now reopened after a closure was put in place following a collision which resulted in the death of a horse.
A horse has died and another is believed to be seriously injured following a collision on the A1(M) between Stevenage and Welwyn.
There are severe delays on the A1(M) southbound after a crash between the two Stevenage junctions earlier today.
The A1(M) has now reopened following an incident this afternoon near Hatfield which saw a child fall from a moving van.