Denton police have closed the southbound service road along Interstate 35E at Bonnie Brae Street to investigate an accident involving an 18-wheeler. The truck jackknifed, collided with a car and caught fire about 1 p.m. Denton police Officer Orlando Hinojosa said the driver of the car was taken to an area hospital as a precaution but no one was seriously injured. Fire marshal Rick Jones said his unit was called to the scene, but will not investigate. They were working to contain a fuel spill, Jones said. Traffic is snarled around UNT's Apogee Stadium as drivers looked for alternate routes.