Here’s a Route 66-themed slide show of black-and-white images by Mike Severson, whose Flickr account contains plenty of other goodies.
Not all of the photos are from the Mother Road, but the vibe certainly comes from there.
https://youtu.be/Tcq0NKK6QqE
The version of “Route 66” is by Nat King Cole, who made Bobby Troup’s song famous.