The incident was reported to the police shortly after 2.30pm and the road has been closed since about 3pm on Tuesday, October 24. A spokesperson for the force said drivers should avoid the area.
According to the traffic monitoring service Inrix, traffic between Caenby Corner and Lincoln is worst affected. Google Maps shows some heavy congestion past Normanby Cliff Road. However, traffic on connecting roads appears to be coping well and moving freely.
The number of vehicles involved or the extent of any injuries is not yet known. Lincolnshire Police has been contacted for further information.
This is a breaking news event and we will bring you live updates as they come in.