FORT TEJON, Calif. — Investigators believe the driver killed after veering off the road on Interstate 5 Tuesday may have been under the influence, the California Highway Patrol reported.

According to CHP, the driver, a 63-year-old man from Lynwood, was driving a 2008 Lincoln Mark LT truck southbound on the I-5, near the Grapevine Commercial Vehicle Enforcement Facility, when he veered off the road.

CHP officers determined the driver had moved the truck abruptly to the right, where it collided with the left side of a Chevrolet pickup, and continued southwest until it collided with an asphalt curb and chain link fence, then overturned.

Responding officers pronounced the driver dead at the scene.

The no. 3 and 4 lanes were initially closed as crews cleared the scene.

The collision is still under investigation.