idk about these; I haven't driven significantly in Toronto in over a decade, but Calgary has mobile speed cameras in unmarked cars, so they can be moved around. They just look like a car parked on the side of the road. And people slow down for school zones in Calgary.
I think they're very effective. As soon as you cross the border to BC, where automated speeding cameras are illegal, people drive about 10km/h faster, it feels like. On Deerfoot (in Calgary), you'd occasionally have someone pass at +30. On the Island Highway, +40 isn't atypical. (That's 150 km/h... Crazy fast, especially knowing that kinetic energy is the square of velocity.) And people regularly blast through school zones in BC at +30, and +40 isn't overly unusual (70 km/h in a 30 zone). (Comparatively, 50 in a 30 zone was the usual max I noticed in Alberta).
Or maybe it's just that BC drivers are massive speeders, and the speed cameras thing isn't the reason. Hard to know without data.
Sure, but even so: that hardware isn't going to be obsolete or wear out for a long time.
Compared with going to a concert that can be $10K for 2 people to attend a single show.