Motorcyclist Killed in Highway 4 Crash in Concord, CA

California Vehicle Code 21658 requires drivers to stay within a single traffic lane and to change lanes only when it can be done safely. Multi-vehicle freeway crashes involving a motorcycle, a truck and a sedan — like Monday’s collision on Highway 4 — often trace back to a driver failing to see a motorcyclist before merging or changing lanes. Investigators have not yet said whether an unsafe lane change contributed to this crash. Motorcyclists have the same right to the full use of a traffic lane as any other vehicle on the roadway.

California Vehicle Code 27803 requires every motorcycle rider to wear a helmet that meets state safety standards, and reports indicate the rider involved in Monday’s crash was wearing one. A helmet cannot prevent a collision, but it can reduce the severity of head trauma and is one factor considered when evaluating how a crash unfolded. Under California’s comparative negligence rules, a rider’s family can still pursue compensation from an at-fault driver even where partial fault is disputed.