A motorcyclist was flung under a semi-truck after crashing into a car, prompting a major closure on the southbound Interstate 5 in Oceanside Saturday.
The incident started when the motorcyclist -- a man in his early 30s -- and a Toyota Corolla collided around 8 p.m. just south of Oceanside Boulevard, according to the California Highway Patrol.
The rider and his bike were then tossed under a semi-truck.
"He was trapped under the rear axle of the big rig," said CHP Officer Chris Parent. "He was dragged about a 150 feet and under the big rig the entire time."
The motorcyclist was taken to Scripps La Jolla Hospital with major injuries.
The crash blocked all southbound lanes of I-5, forcing the CHP to issue a Sig Alert.
Officers were able to open one lane of traffic about 20 minutes later. By 10 p.m., two more lanes were opened.
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Investigators are still trying to determine whether the motorcyclist or the driver of the Toyota was at fault.
