Template:Main Page/Did you know?/21

...that Arizona was the first state to designate U.S. Route 66 (pictured) as a historic route on December 20, 1987?
...that Pacific Highway No. 1 in Oregon was the first state highway to be completely paved between two state lines?
...that most rental car companies don't allow customers to drive vehicles on the Dalton Highway in Alaska, due to its dangerous conditions?
...that M-185 on Mackinac Island in Michigan is the only state highway in the United States cars aren't allowed to drive on?
...Utah state routes 900 and 901 are actually dirt roads that were previously either federally or county maintained, but assigned state route numbers to give the state authority to block shipments of nuclear waste?

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