I personally don't agree with the 25kmph is not enough logic. I live in Cambridge, which has fairly decent cycling infrastructure. In my experience, I''m nearly always faster around town on my bike than my friends driving around, once you account for finding parking as well. I never cycle above 25, certainly not inside the town. And I dont think I would want to share cycling lanes with people doing more than that either, and I cycle faster than most people here. Cycling routes are safe because people are cycling at reasonable speeds to get to where they want to go. I haven't lived in the US where everything is much farther apart, amybe it makes more sense ther, but at least for where I live, 25kmph is plenty to get to where i want to go in time, while enjoying the views along the way.