Where do the lowest numbered North-South routes begin?

The correct answer indicates that the lowest numbered North-South routes begin in the west portion of the United States. This is because the numbering system for highways in the U.S. is based on a grid system where the lowest numbers for North-South routes start at the westernmost points and increase as they move eastward. For instance, U.S. Route 1 runs along the entire East Coast of the country, while U.S. Route 10 starts further west. This system helps in navigation and route planning by providing a clear understanding of how highways are arranged geographically. Understanding this system is vital for drivers as it aids in finding directions and recognizing how highway numbers reflect their locations.