What the study doesn't say is the length of time they monitored these intersections, they don't investigate it long enough at all. It's been done before in several other states. While rear end accidents go up something like 600% at these intersections with cameras it's only temporary, after some time the accident rate at these intersections decreases considerably and the study doesn't actually cover the long term affect, hell it doesn't give any time frame of how long they studied this.
There was a big article about this in Sport Compact Car and several other magazines when this was first starting up in California. The other issue that has been mentioned here in Cbus is if a ticket is issued and the owner is not driving and who the responsibility falls to in certain situations.
That study does say that it's a fact that red light running has been on the decrease for years in Florida and it's probably the same most other places and I personally agree with their belief that it's just another way of generating extra cash.