The A1 at Carpenters Lodge, near Stamford, has reopened after an accident involving three cars.
A Porsche 911, a BMW and another car were involved in the crash, which happened on the southbound carriageway at 7.45am today (Thursday).
One of the vehicles was on its roof and one was in the central reservation.
No-one was seriously hurt and the road has now reopened.
Traffic had been diverted through Stamford town centre, causing traffic to back up.