Police play an essential role in supporting bicycle transportation by enforcing the traffic laws that allow all road users to reach their destinations safely. As bicycle travel has grown in popularity, the public has asked law enforcement to become more involved in bicycling issues. This can present challenges for police, because misconceptions about safe bicycling practices and state law are widespread among the public. The Bicyclist Safety and Law Enforcement in-service training program was developed by the Coalition of Arizona Bicyclists in cooperation with the Glendale, AZ police department to provide the most accurate and relevant information available to Arizona police officers. The program covers relevant traffic laws, common crash types and frequency, best bicycling practices, and effective enforcement techniques so that law enforcement officers can be confident when discussing bicycling issues with the public, and can effectively prioritize related enforcement and outreach activities to promote public safety.