rule of the road

noun phrase

Definition of rule of the road 

: a customary practice (such as driving always on a particular side of the road or yielding the right of way) developed in the interest of safety and often subsequently reinforced by law especially : any of the rules making up a code governing ships in matters relating to mutual safety

First Known Use of rule of the road

1798, in the meaning defined above

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The first known use of rule of the road was in 1798

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