Yes, lane-splitting is legal for motorcycles in California under certain conditions. Lane-splitting refers to the act of riding a motorcycle between lanes of traffic moving in the same direction or passing slower-moving vehicles within the same lane.
In California, the California Vehicle Code Section 21658.1 specifically addresses lane-splitting.
Regarding helmet usage, California requires all motorcycle riders, regardless of whether they are lane-splitting or not, to wear a helmet. The helmet must meet the Department of Transportation (DOT) safety standards.
It's important to stay updated with the latest laws and regulations, as they may change over time. Consulting the official California Department of Motor Vehicles (DMV) website or contacting local law enforcement agencies can provide the most accurate and up-to-date information regarding lane-splitting and helmet requirements in California.