rule of the road
nounoften pl. rules of the road
- A set of customary practices, especially for the operation of a motor vehicle, boat, or aircraft, established to promote efficiency and safety.
- A set of established rules or practices, usually unstated, intended to minimize confusion or conflict: “Great powers &ellipsis; wishing to avoid war could resort to one of three tools: condominium, spheres of influence or rules of the road” (Charles William Maynes).