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Why Do Some US Interstates Have Duplicates?
Beaver Geography
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Oct 4, 2026
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0:00
Introduction to U.S. Interstate Numbering System and Spur Routes
3:56
Case Study of I-84 and Duplicate Interstates in New York and Illinois
5:59
I-87 and I-76: Major Routes with Number Conflicts
7:01
I-74 and Other Unfinished or Disconnected Routes
8:00
Conclusion: Why the System Is Confusing and Unlikely to Change
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