The collision is believed to have happened shortly before 5pm and one motorist contacted the Sleaford Standard to say they could see a car in among some trees, a van and another car behind it blocking one of the eastbound lanes of the Sleaford A17 bypass heading away from the roundabout.
It is causing congestion as it is narrowing the road from two to one lane as drivers exit the roundabout.
A Lincolnshire Police spokesman confirmed: “It is a single vehicle collision where a car has left the road and collided with a tree. Thankfully it doesn’t look to be too serious, no reported injuries. The incident was called in at 4.48pm.”
You are advised to avoid the area at the present time.