I-29

It was early May in 1960 that the northernmost stretch of I-29 was dedicated. It was the first US Interstate to connect to an international border. But even though the stretch was dedicated, it still wasn't ready. It would take seventeen more years for the highway to be completed.

The U.S. Interstate Highway System is the biggest civil-engineering project in world history – 46,876 miles in length. It was funded with gasoline taxes…