Brian Deming, 28, of Redwood City was traveling at a high rate of speed in the fast lane of southbound El Camino Real at about 11:30 p.m. when his motorcycle collided with a Volvo driven by Christopher Bowman, 45, of Menlo Park, according to Atherton Police Lt. Joe Wade.
Mr. Bowman, who was the only person in the car, wasn't injured, Lt. Wade said. Mr. Deming's condition is unknown.
Atherton police are investigating the incident.