Gateway Arch- Distance
- 55 km

Drivers navigate disjointed segments across multiple states, requiring careful route planning across former alignments rather than following a single unbroken highway.
The road originated by consolidating existing regional paths, auto trails, and military wagon corridors rather than creating new cross-country pavement. It formed an official connection from Chicago to coastal Southern California, functioning as a primary east-west transport link across the prairies and southwestern desert regions.
Federal planners designated the numbered highway to unify private auto trails under a coherent national designation. Civic leaders pushed promotional campaigns and long-distance footraces across the states to spur local business, turning the road corridor into a recognized fixture in American music, television, and migration history.
Modern travel requires navigating bypasses, decommissioned alignments, and discontinuous business loops. Interstate highways replaced the original throughway, shifting high-speed logistics away and leaving historic roadside communities dependent on preserved heritage sites, independent motoring stops, and seasonal road travelers.
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