We have mild, flat, and dense. Boston and NYC, for example.
I think the only missing piece in many cities is funding and prioritization.
I think the only missing piece in many cities is funding and prioritization.
[0] https://www.wired.com/2015/06/copenhagenize-worlds-most-bike...
http://www.letsrun.com/forum/flat_read.php?thread=728621
(A discussion of how "hilly" Boston is with respect to the Boston Marathon.)
"If you live in Kansas Boston is hilly. If you live in Colorado Boston is flat."
I think the contributing factor is delivery people who use their bikes a lot, now another problem is that they are completely ignorant of any traffic rules, but can't have it all I guess
Of course, you need decent alternative infrastructure - buses, trains etc.