What is the longest highway in Texas?
I was thinking I-10 but obviously that wouldn’t qualify as a highway
Do you mean other than interstates ?
highway 83
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We have a winner
U.S. Route 83 is the longest numbered highway in Texas, spanning 906.5 miles from the U.S.-Mexico border in Brownsville to the Oklahoma state line
U.S. Highway 83, which runs from Brownsville to the Oklahoma state line near Perryton, a stretch of 906.5 miles
What is the longest road in Texas in
miles?
And the longest in all the USA?
I would have to think it would be Frontage Road, because everywhere I travel, I see a sign for it. 
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The longest road in the U.S. is U.S. Route 20. It is a coast-to-coast highway stretching roughly 3,365 miles from Newport, Oregon, to Boston, Massachusetts, crossing 12 states and passing directly through Yellowstone National Park. [1, 2, 3]
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As a kid i always wondered, who is Frontage and why are so many roads named after him
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Me too!