A man driving a sedan died early Friday after slamming into a parked big-rig in Marin County near Larkspur, according to the California Highway Patrol.
The deadly crash occurred just before 6 a.m. on Sir Francis Drake Boulevard near Main Street.
"Apparently the driver was traveling at an unknown speed and for an unknown reason drifted off the road and crashed into the back of a large, parked trailer," said officer David Bruestle.
The big-rig was hauling construction equipment and was parked on the right shoulder of the road, Bruestle said.
"According to a witness, he was travelling anywhere from 30 to 40 mph and he drifted off the road and then back into the lane and drifted back off again and ran into the back of the trailer," Bruestle said of the truck, which has a large flatbed.
The victim, a Honduras native who was living in California, was approximately 28 years old, he said.
The big-rig is so heavy that its driver, who was asleep inside, didn't feel the impact, according to Bruestle.
"It would have been like driving into a concrete wall," he said.