Lincolnshire Police close A1 in both directions at Colsterworth near Grantham following collision
Police have closed a section of the A1 in both directions following a collision.
The A1 at Colsterworth has been closed while officers deal with the incident.
Lincolnshire Police tweeted: "The A1 is closed is both directions with the southbound carriageway likely to be closed for some time."
Officers are working to re-open the northbound carriageway shortly.
People have been asked to avoid the area.