Why is Route 66 now 40?

Interstate 40 subsequently replaced a large segment of Route 66 and the roadway was decommissioned in 1985. However, in the aftermath, a variety of non-profit groups were formed to help preserve the historic highway and much of Route 66 remains drivable today.



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Completed in 1926, Route 66 winds 2,448 miles from Chicago to L.A. Through most of the Western states, Route 66 follows Interstate 40, which eventually replaced much of the Mother Road. In some areas, the remnants of 66 parallel the interstate as a frontage road.

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Route 66's popularity led to its downfall, with traffic swelling beyond its two-lane capacity. In 1956, legislation created the Interstate System, and over the course of three decades, five separate interstates bypassed segment after segment of Route 66.

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Portions of the road have now been designated as National Scenic Byways or as “Historic Route 66” in several states including Arizona, New Mexico, Illinois, and Missouri. Vintage Shell gas station (left) built in 1926 on Route 66 in Mount Olive, Illinois (photo taken between 1980 and 2006).

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And it's a prime example of a rebirth of Route 66 that's occurring in various parts of the country. Town leaders here decided to use the history of the famous road to their advantage, 20 large murals, a museum of Route 66 collectibles, and much more, all bringing in tourists from around the world.

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20 Facts About Route 66
  • Route 66 was built as an efficient way to get from Chicago to Los Angeles. ...
  • The “Father of Route 66” was an Oklahoma businessman. ...
  • In 1928, promoters held a foot race across Route 66. ...
  • The New Deal helped finish Route 66. ...
  • The Great Depression spurred thousands to head west along Route 66.


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During the 1940s and '50s, Route 66 was known as The Main Street of America. The glittery new blacktop stretched more than 2,000 miles over eight states from Chicago to Los Angeles, winding through small towns, past hundreds of cafés, motels, gas stations and tourist attractions along the way.

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Without much fanfare, the Mother Road was removed from the U.S. Highway System. The end of Route 66 had been a long time coming, though. The new-fangled Interstate Highway System had taken its place and the old, crumbling road no longer had much purpose.

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Although it is no longer possible to drive US 66 uninterrupted all the way from Chicago to Los Angeles, much of the original route and alternate alignments are still drivable with careful planning. Some stretches are quite well preserved, including one between Springfield, Missouri, and Tulsa, Oklahoma.

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Jericho Gap, Texas This became so profitable that there were rumors that some residents watered down the road to increase the plight of Route 66 travelers. Eventually, Route 66 was rerouted to higher ground in the 1930s and the area dwindled into a ghost town.

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