Partly absorbed by 1-10 and party given over the ravages of time—the Old Spanish Trail was the first to highway to connect the East Coast to the West Coast through the southern states.

[Updated 8/13/2015] Sarah Laskow writes about the Old Spanish Trail, completed in 1929 as "2,743 miles of brick, asphalt, concrete, and wooden plank, [crossing] the southernmost states from East to West, starting in St. Augustine, Florida, and ending in San Diego, California."
According to Laskow, the Old Spanish Trail is mostly a ghost road now, but an organization called OST100 is working to restore the road to its "former vigor" as "the kind of road people fantasize about traveling from end to end."
The article includes a lot more detail about the history of the road, its current state, and what it will take to restore the road in time for its 100-year anniversary.
[This post was updated to reflect the correct historic status of the OST]
FULL STORY: RESURRECTING THE ORIGINAL ROAD TRIP ON AMERICA'S GHOST HIGHWAY

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Analysis: Cybertruck Fatality Rate Far Exceeds That of Ford Pinto
The Tesla Cybertruck was recalled seven times last year.

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