A LORRY has overturned on the A1 south of Grantham, causing serious delays on the motorway.
The A1 is now closed with queueing traffic between the A607 junction in Grantham and the A151 junction in Colsterworth, because of a jackknifed lorry.
Diversions are now in operation and people are being urged to follow the hollow diamond symbol.
The congestion stretches to Long Bennington.