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Witnesses of the crash said the Vespa driver was traveling 60 mph on a fairly tricky curve.
Imagine the shock of a human body falling onto your car while you sit at a stop light.
That's what happened Wednesday night in the North Bay city of San Rafael.
The thud was the end of a chain reaction accident that began on Highway 101 some 40 feet above.
The California Highway Patrol says a man on a Vespa scooter lost control while driving northbound on the San Rafael viaduct overpass. He rammed into the center guard rail and the force of the collision flipped his body over the rail. He fell in the gap between the north and southbound lanes and on to Second Street.
The unidentified man landed on the roof a VW Jetta that had two teenagers inside. They were not hurt, according to the Marin Independent Journal.
The Vespa driver suffered major injuries. He was taken to Marin General Hospital and was last listed in critical condition.
There are reports the man was carrying a dog on the Vespa. The CHP found a dead dog on the highway nearby the accident scene. Police haven't been able to interview the Vespa driver to confirm it is his dog who died.