One person has been airlifted to hospital after a bus and a car crashed on the A1.
The vehicles were travelling in different directions before the crash near Colsterworth at about 13:15 BST, Lincolnshire Police said.
It is not known whether there were any passengers on the bus but there are no reports of any other injuries.
The A1 is closed and emergency services remain at the scene. Police are advising motorists to avoid the area.
Lincolnshire Police also tweeted about a second crash on the A1 nearby, which is expected to cause further disruption.
They warned motorists to stay in their cars and keep off the carriageway.
Officers dealing with the RTC at Little Ponton are asking motorists stuck in the traffic to stay in their cars and not want wander around the carriageway. We are working with Highways to clear the backlog of traffic as soon as we can.— Lincolnshire Police (@lincspolice) July 2, 2018