It seems like a fairly risky assumption to make just from you having it work like that in the US.
As a side note, that % thing (day fines) don’t cover all speeding tickets, since they’re considered so minor. It’s the bigger offenses (of speed limits and in general) that are covered. So it actually covers other stuff too, not just speeding.
Here’s a pic showing the amounts. It has the speed limit, how much over the limit you were and how much you end up paying as a fine. Bottom one is “regardless of the limit” and “over 20 km/h”, so whenever you go over by over 20 km/h, you pay “day fines”.