Two lanes of Interstate 91 South are closed between exits 13 and 14 in Wallingford because of a tractor-trailer fire.
The middle and right lanes are closed after the cab of truck carrying lumber caught fire, police said.
The highway was shut down, but has since reopened.
State Police and the Wallingford Fire Department are at the scene.
The driver was not injured, police said, and the lumber did not catch fire.