I can’t tell whether this video is from someone hanging a camera out the car window or attaching it to a bicycle. But this is footage of someone crossing the Lake Overholser Bridge.
It was built west of Oklahoma City in 1924, predating Route 66. But it became a prominent alignment of the Mother Road.
If you want to check it out for yourself, this map link shows you where it is.
See the tracks \on the right of road at end of clip? my jeep!!!