http://www.blanelaw.com Law Offices of Mark Blane, APC Injured in a bicycle accident in San Diego California? Attorney Mark Blane discusses CA Vehicle Code Section 21200 which governs bicyclists. He focuses on the correct direction of travel a bicyclist is required to go on California roadways - with or against the flow of traffic? Most folks do not know it is against the law to go against the flow of traffic. The best way to remember the rule is as follows" always ride with, but walk against traffic. As a bicyclist in California, you are held to the same standard of care as a regular motor vehicle. So you must obey all traffic rules just like any other vehicle out on the roadway. Hence, you MUST ride with the flow of traffic.