Originally Posted by
rm -rf
Here's an example of the Heat Map in rural southern Ohio. Red/purple roads are the most popular, faint blue gets some bike usage. (But even the four lane divided highway nearby got some bike travel -- I don't know why any rider would pick it when there's much better nearby roads.)
I think a lot of the four lane routes get some extra exposure when people forget to turn their GPS off at the end of a ride and drive home. There's one near me that has wide shoulders and is frequently used by cyclists. Fine, but I don't believe the segment leaders average over 55 mph riding their bikes!