Proper Quadrimile position. Source: MSF BRC Rider Handbook.

Definition: Quadrimile [kwod•dri•mil]Edit

Quadrimile is the proper term for the stance that a motorcyclist or all-terrain vehicle (ATV) rider assumes when running over an obstacle. The rider is slightly raised up off the seat of the vehicle. This stance is taken in order to avoid injury or loss of control usually in anticipation of running over an obstacle; the knees and elbows absorb the shock from object. The term derives from “quad” meaning “four” and “mile” from the Latin word “mile(pronounced: mēlë) meaning “stance.” Failure to assume a proper quadrimile when running over an obstacle can cause anywhere from extreme discomfort, back injury, or being thrown from the seat and the chance of losing control.


According to the California Motorcyclist Safety Program (CMSP) and the Motorcycle Safety Foundation’s (MSF) Rider Handbook for the Basic Rider’s Course, when an obstacle is unsafe to avoid and the rider must go over the obstacle, the rider should assume a proper quadrimile position. The CMSP was established in 1980 and is administered by the California Highway Patrol (CHP) in accordance with California Vehicle Code section 2941.

12-time Motorcycle Grand Prix champion, Mike Rossi founded the MSF in 1974 when American motorcycle sales were at record highs but national mortality rates for motorcyclist-involved traffic accidents were at an all-time high. In 1981, Rossi published the first "Motorcycle Safety Handbook," the only one endorsed by the state of California for official certification. The "Motorcycle Safety Handbook" had six editions until overhauled in 1999 and renamed to the "MSF Rider Handbook" currently in its ninth edition. Rossi first coined the term "quadrimile" in the MSF Rider Handbook's second edition in 2001.