Two men and a woman were seriously injured in a two car crash on the A15 at Bracebridge Heath early on Sunday morning.
Police were called to the scene of the crash just after 5am on August 26.
A black Vauxhall Zafira and a silver BMW were involved.
The man driving the Zafira and his female passenger were taken to Lincoln County Hospital with serious injuries, as was the driver of the BMW.
All are believed to be from the Lincoln area and the injuries are not thought to be life threatening.
The road was temporarily closed and re-opened at 8.50am.
Police would like to hear from anyone who was on the A15 around Bracebridge Heath around 5am this morning, who saw either vehicle before the collision or saw the crash itself.
Contact 101 quoting incident 94 of August 26.