Authorities Monday sought witnesses to a fatal collision on Interstate 15 in Jurupa Valley in which a Ford Mustang collided with a pickup truck, then veered off of the freeway and slammed into a sign, causing the car to split in half.

The crash that killed the Mustang’s driver happened about 10:50 p.m. Sunday on southbound I-15, just south of 68th Street, according to the California Highway Patrol.

Officer Juan Quintero said the Mustang was in the No. 2 lane, “traveling at a high rate of speed,” when a Ford F-350 in an adjacent lane moved into the Mustang’s path, causing the car to hit the driver’s side of the pickup truck.

“The impact caused the Mustang to travel out of control in a southwesterly direction, onto a dirt embankment, where it collided with a freeway sign post,” Quintero said. “The collision with the sign split the Mustang in half.”

The driver, whose identity was not immediately released, was pronounced dead at the scene minutes later by Riverside County Fire Department paramedics.

The pickup driver stopped in the freeway’s center median. He was not injured.

The crash remains under investigation, and anyone with information was asked to contact the CHP’s Riverside office at 951-637-8000.

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