Who used route 66 in its heyday?

In its heyday, Route 66 was primarily used by a diverse group of travelers, including families on road trips, migrants seeking better opportunities in the West, and adventurers exploring the American landscape. It became known as the "Main Street of America," attracting tourists and commercial traffic alike. The highway also served as a vital route for truckers and businesses, connecting small towns and fostering economic growth along its path from Chicago to Santa Monica.