The Interstate Highway System and other random thoughts

Our road trip was made possible by the Dwight D. Eisenhower National System of Interstate and Defense Highways - otherwise known as the Interstate Highway System.  

Our main route was I-40 which we started on in Nashville, Tennessee, and ended at Kingman, Arizona.  The next main route we traveled was I-70 from Kansas City, Kansas, to Breezewood, Pennsylvania.  

The Interstate Highway System is an incredible feat of engineering.  It would not have been possible to do what we did over 16 days without the Interstate.  We could travel long distances at sustained speeds of 70-80 mph, especially in Oklahoma, Texas, New Mexico, and Arizona.