Two motorcyclists were seriously injured in a collision with a box truck in San Mateo County's Skylonda area Friday afternoon, according to the California Highway Patrol.
The two motorcyclists, a 42-year-old San Francisco man on a Yamaha and a 22-year-old Santa Clara man on a Kawasaki, were riding west on state Highway 84 just west of Skyline Boulevard around 12:30 p.m. when the older man crossed the double yellow lines to pass another vehicle in front of him, CHP officials said.
The Yamaha struck the right front of an eastbound Freightliner box truck and then a tree before coming to a halt on the south bank of the highway.
The Kawasaki, which was directly behind the Yamaha, then hit the left front bumper of the truck. That rider came to a rest on the north bank of the highway.
Both suffered major injuries in the crash and were taken to Stanford Medical Center for treatment.
The truck driver, a 34-year-old Hayward man, was not injured.
Drugs and alcohol do not appear to have been a factor in the collision, which remains under investigation, the CHP said.