Following the passage of the Federal-Aid Highway Act of 1956 at the behest of President Dwight D. Eisenhower, 9067 miles of paved road were constructed in over a dozen states. This, of course, was the first year of the U.S. Interstate, a system that now covers nearly 50,000 miles and accounts for a quarter of all highway traffic in the country.

Geotab, a company specializing in GPS vehicle tracking devices, illustrated the evolution of the Interstate System with a new infographic. It charts the growth of what some have hailed as the “greatest public works project in history.” (However, not everyone loved it, and some people who had been displaced by the construction organized protests in the ‘60s, causing work to shut down in some areas.)

Regardless, it remains a crucial part of America's transportation network. To see how the interstate has changed over the years, check out Geotab’s infographic below.