A 33-year-old man is in critical condition after a crash on the A590, between Greenodd and Haverthwaite, in Cumbria.
It happened on 23 May at about 9:50am. The road was closed in both directions, leaving at least two miles of traffic at a stand-still for several hours while investigators attended the scene.
The man from Preston was driving a Mercedes Sprinter - he was airlifted to the Royal Preston Hospital and remains in a serious condition.
A truck driver, 48, from Yorkshire, who was involved in the incident was uninjured.
Police are appealing for witnesses to contact 101.