I am readind the latest BBC TOP-GEAR Magazine and there is a little paragraph that reminds me of the first cars film, The journalists are driving accross the US without using highways in a Ford Focus ST, anyway the Paragraph is this. "We crossed into Arizona and picked up old Route 66, Americas most famous road and the nations first paved Highway. In the great depression, Sixty-six was the very spine of the USA, As hundreds of thousands journeyed west to escape the dust bowl and seek there fortunes. Now its near empty: bypassed by the interstate to the south, Its motels and diners abandoned.
"first paved highway" is a little misleading. There were plenty of paved roads in the US before Route 66. The National Pike (which runs through my town to this day) was completely paved by 1830, long before Arizona was even part of the US. US-40 and I-70 still use much of the same alignment as the National Pike to this day. Of course, there were plenty of paved roads and highways in Detroit in the early 1900's too.