Police are searching for a van driver after a fatal crash on the A1 near Grantham.
The victim is a man in his 50s. The other car involved in the crash was a white Ford Transit.
The crash, as previously reported, happened just before 11.30pm on Thursday, May 2 and has been causing miles of delays this morning.
A three-mile section of the road is expected to remain closed until at least midday on Friday, May 3.
Lincolnshire Police are now asking for anyone who saw a white Ford Transit van and trailer travelling in the area.
Anyone who saw the van is being urged to call 101, quoting incident 484 of May 2.