Brisbane

Going by "fat man on a freakishly heavy bicycle" standards of a 350 pound bicycle crashing into someone at 15kph you get about 1,378 Joule energy out of it.

That's about the energy of your average 2 ton car hitting someone at 5kph (~1929 Joule).

Fat man on a freakishly heavy bicycle at 10kph nets you about 612 Joules, in car terms that would be about 3kph, I feel like most of them wouldn't even do that without stalling

I'm not going to claim either can't actually be dangerous, you kind of have to wonder about how the lines are drawn here, especially given you have much, much more incenitive to not crash into someone on a bicycle compared to in a car