What is Law Of The Road?

Legal Definition
A general custom in America (made obligatory by statute in some states) and other countries for pedestrians and vehicles, when meeting in a street or road, to furn to the right in order to avoid danger of collision. See Riepe v. Elt-ing, 89 Iowa, 82, 56 N. W. 285, 26 L. It. A. 769, 48 Am. St. Rep. 356; Wright v. Fleisch-man, 41 Misc. Rep 533, 85 N. Y. Supp. 62; Decatur v. Stoops, 21 Ind. App. 397, 52 N. E. 623.
-- Black's Law Dictionary
Legal Definition
The custom in America of keeping to the right-hand side of the road in passing others. See 89 Iowa, 82, 48 Am. St. Rep. 356, 26 L. R. A. 769, 56 N. W. 285.
-- Ballentine's Law Dictionary