Always ride with, never against, traffic. Obey traffic signs and signals, markings and regulations. Use hand signals to indicate left turns, right turns, and stops. Check your bike before every ride to be sure it's in safe operating condition. All riders should arrive 15 minutes before start times - rides will leave promptly at the stated start time.
Accident prevention is the first principle of safety, but accidents sometimes do happen.
Helmets are the best means of minimizing head injuries.