ruleof the road

rule of the road n. pl. rules of the road

1. A set of customary practices, especially for the operation of a motor vehicle, boat, or aircraft, established to promote efficiency and safety. Often used in the plural.

2. A set of established rules or practices, usually unstated, intended to minimize confusion or conflict. Often used in the plural: “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).

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