In California, motorcycles are generally not allowed to drive side-by-side in the same lane. According to the California Vehicle Code (CVC) Section 21656, motorcycles are entitled to the full use of a lane and should not be overtaken in the same lane by other vehicles. This means that motorcycles are typically required to ride in a single-file formation within a lane, rather than side-by-side with another motorcycle.
California's "lane splitting" law (CVC Section 21658.1) allows motorcycles to ride between lanes of traffic or between rows of stopped or slow-moving vehicles. Lane splitting should be done in a safe and prudent manner, and it does not involve motorcycles riding side-by-side in the same lane.
It's important to note that traffic laws can change over time, and it's always a good idea to refer to the most recent version of the California Vehicle Code or consult with local authorities for the most up-to-date information on motorcycle lane positioning and regulations in California.