Not sure about the cars, but I thought we had to make our bike return runs in the hour in '69. I had black leathers and the van had no A/C that year!
Probably a faulty memory, or just not that many return runs in those days. I remember we had no shade for return run record certification, because I have a pic of Earl Flanders filling out the paperwork from one of my records and we were not cooking from the midday heat, yet.
I guess I need to visit with Roosevelt if he's there, this year. He's the only other bike rider I know of, from then, who runs these days. Perhaps some one will speak up who remembers more clearly. I'm just realizing that if you were running that year, you're lucky to remember anything at this age!
Those "down" return runs were faster, for many of us, all week. Curious.
....always wondered why.