The Oakland Bike Patrol consists of volunteers partnering with land managers and the Oakland Police Department to assist, educate, and inform trail users in order to enhance their recreational experience at Joaquin Miller & Dimond Parks. OBP is dedicated to preserving and maintining trail opportunities for mountain bikers in city parks. Volunteers provide maps and directions, monitor and report adverse trail conditions, encourage responsible riding, and assist in medical and mechanical emergencies. Best of all you get to ride some of the best east bay trails, serve your community, meet great people, and help ensure continued trail access..