An older "sidewalk highway" segment of <a href="https://en.wikipedia.org/wiki/U.S._Route_66_in_Oklahoma" class="extiw" title="w:U.S. Route 66 in Oklahoma">U.S. Route 66</a> near <a href="https://en.wikipedia.org/wiki/Miami,_OK" class="extiw" title="w:Miami, OK">Miami, Okla</a>.  If you look along the edges of the paved section in the middle of the road, you can see the raised "curbs" of concrete that outline the actual pavement.
Abraham Ezekowitz
CC BY-SA 3.0
Photograph while travelling, <span class="int-own-work" lang="en">Own work</span>