Drivers have been warned of severe delays following a crash involving a white van and a blue BMW on the Magic Roundabout, Hemel Hempstead.
A police spokesman said: "We’re currently dealing with a collision involving a white van and blue BMW on the Magic Roundabout in Hemel Hempstead."
"There is likely to be significant traffic congestion so we're advising motorists to please avoid the area. Thank you for your patience."
More to follow.