Following a report of a serious collision on the A16, Lincolnshire Police has closed a section between Station Road and the B1201, North Thoresby.
The temporary diversion route currently in place for the A18 has been changed to accommodate this incident. A section of the A18 between Ludborough and Ashby Hill roundabout has been temporarily reopened.
This temporary diversion route will be in place until advised by Lincolnshire Police.
Motorists are being advised to avoid the area.