Five people were seriously injured in a crash near Market Rasen on Monday night.
It happened at around 9.30pm at the junction of the A1103 and A46, Caistor Road, Market Rasen.
A black Ford Fiesta and a Land Rover Freelander were involved in the crash.
The road was closed for some hours whilst the police investigation took place and debris was cleared.
Police have not released further details about the people injured, but are appealing for witnesses.
Anyone who was in the area before saw either vehicles before the crash or saw the collision itself is asked to contact 101 quoting incident 440 of February 11.