The A1M motorway is shut in the two bearings in Hertfordshire after a motorbike crash.
Police said the street was closed close Welwyn, between intersections six and seven, after the accident at 11:27 GMT.
Two individuals were truly harmed and an air emergency vehicle arrived at the scene.
Police said the street could be shut down for “some time”. There are broad deferrals and the power requested that drivers prepare and maintain a strategic distance from the territory.