The SUV was driving east on I-580 near the Mountain House Parkway exit at a “high rate of speed” at around 2:00 p.m., according to California Highway Patrol officer David Armstrong.
Witnesses told police that the SUV veered left into the grass median, crossed over westbound lanes and went into a field north of the road, Armstrong said.
The Pathfinder then crashed through a chain-linked fence at the edge of the freeway embankment and began to roll across the field approximately 20 times, Armstrong said witnesses told police.
A produce hopper, about 200 feet from the edge of the freeway, stopped the vehicle from rolling farther.
Armstrong said the driver sustained serious injuries including trauma to the back of his head.
Police declined to release the man’s name at the scene.
The driver was freed from the wreckage by Tracy fire crews and flown by medical helicopter to a Modesto hospital.
No other vehicles or passengers were involved in the crash and the freeway remained open to afternoon commuter traffic.
The cause of the accident is still under investigation by CHP officers.
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