I actually disagree that these cameras make the roads safer.
In the mornings when I'm driving to work, I pass a camera on Camp St next to the International School. It is also a school zone. As soon as I get to that zone (where there are schoolkids everywhere), I have to look down at my speedometer and fiddle around trying to make sure that I am not going above the speed limit. In the meantime, I worry that because my eyes are off the road, I could hit someone crossing the street!
I imagine I'm not the only one that takes their eyes off the road when they see a speedcamera sign.