RELATED: Man killed in freak accident on Hwy 101 in Palo Alto identified
CHP officers say the bolt may have fallen off a vehicle, or been kicked up from the road.
The object hit the driver, who was driving northbound on U.S. Highway 101 in Palo Alto Friday afternoon.
Witnesses said the man, who appears to be in his early 80s, was struck by the item when it smashed through his windshield near Willow Road at about 1 p.m., said CHP Officer Art Montiel.
Drivers stopped to assist the man, but the driver died at the scene.
After being struck, the driver collided with the center divide, eventually coming to a stop. No other vehicles were involved in the accident.
It's not yet confirmed. It appears this may have been the projectile that may have been kicked by passing traffic. pic.twitter.com/lyjGadKvr0— CHP RWC (@CHP_RedwoodCity) September 17, 2016
.@CHP_RedwoodCity says projectile that killed an elderly driver on NB101 was a large brass bolt.— Katie Marzullo (@KatieABC7) September 16, 2016