rule of the road


rule of the road

n. often pl. rules of the road1. A set of customary practices, especially for the operation of a motor vehicle, boat, or aircraft, established to promote efficiency and safety.2. A set of established rules or practices, usually unstated, intended to minimize confusion or conflict: "Great powers ... wishing to avoid war could resort to one of three tools: condominium, spheres of influence or rules of the road" (Charles William Maynes).