Interstate 40 starts in Barstow, California (an exit off of
Interstate 15), and runs all the way across the country to its end
in Wilmington, North Carolina.
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Interstate highways are identified on signs with a shield-shaped design. This distinctive shield shape makes it easy for drivers to recognize and navigate interstate highways across the United States.
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Because the country is going broke and can't afford it.
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Interstate compacts are subject to Congress approval. This is
set down by the United States Constitution Article 1, Section
10.