In earlier FreightWaves Classics articles, information about several interstates that are part of the U.S. Interstate Highway System (IHS) has been provided in numerical order – Interstate 2, Interstate 4, Interstate 5 (Part 1 and Part 2), Interstate 8 and Interstate 10. The next interstate that will be covered in this series is Interstate 11.
But what happened to the interstates numbered 1, 3, 6, 7 and 9?
If an Interstate 1 existed, it would likely be located west of Interstate 5, which...
https://www.freightwaves.com/news/freightwaves-classics-interstates-that-have-not-been-built-part-1