There are 10-mile queues on the A1 southbound from Grantham this morning after a crash involving two vehicles near Colsterworth.
Traffic is queuing all the way from the junction with the A52 for Nottingham and Grantham town centre, right down to the junction for the B6403.
An eyewitness has told Lincolnshire Reporter that the road is partially blocked and that a number of vehicles were involved.
Motorists should avoid the area if at all possible.
Lincolnshire Police have said that the crash involved two vehicles, and that there were no injuries.