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I'd rather see road safety as a right, in that sense I have to agree making it pay for itself is not a good way of thinking about it. (and it will cause complaints from "us poor motorists" yeah as if you don't have a speedometer and pair of eyes and a driving license, but ok...")
I do wonder if it can pay for itself it is possible to actually get more of it because the argument against everything lately seems to be "but it cost money and we have none..."
https://www.theguardian.com/politics/2019/jun/17/painted-bike-lanes-waste-money-cycling-commissioners
This seems to suggest enforcement can pay for itself.
In Belfast, there is barely any road police. They put up some speed checking wires in some locations (which is going to confirm that, yes, there indeed everybody is doing 40 not 30).
I see the occasional person being stopped (not paying VED/not insured I suspect based on my stereotypes of local drivers) but people being snatched off the road for driving like ejits or speeding in town is very rare.