The longest distance between two exits is Exit 4 to Exit 41: 37.4 miles on I-80 just west of Salt Lake City to Wendover near the Nevada Border. The road is long and straight and there is not much to see (If you are heading west to California, a far more interesting drive is taking Alt-93 at Wendover to Eli NV and then US 50 to Carson City NV - This author had the pleasure of driving that route in 2023)
Two exits on the Florida Turnpike are 40.5 and 48.5 miles apart, but this is not an Interstate highway.
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