I think the parking in the bus lane is more egregious. But in Boston, just parking wherever the fuck you want is completely allowed and unenforced, so good luck ever getting anyone to do this. Cameras are the only hope.So here's the thing. I'm most familiar with how the NYC MTA has implemented their system, and unfamiliar with anyone elses, but if we take their automated bus lane enforcement program as our model, we would need both mobile and fixed cameras, because they do different jobs. (That said, there's probably no reason a different logic could be applied in Boston, but I'd imagine bus mounted cameras struggling with acceptable bus lane use [ie, turns.])
At least in NYC, the bus mounted cameras only capture standing "parked in the bus lane" violations. The 2022 report described it as follows:
Driving in the lane, on the other hand, is the province of the fixed camera system.