The routes initially planned in 1925 . . . . . Matthew Salek's webpage on the US Highway numbering system is now maintained by J.P. Kirby. Alternate US 89 in Arizona. Cardinal directions, such as W EST are placed above the shield. Optional is a old name for this type.
City is the older name for the type.
Usually used for mainline traffic. Uses an Orange banner. Connector Routes, a subset of the type, have been appearing recently in SC and other states. Used for mainline traffic. Rarely used with US routes.