"Evidence clearly shows that camera programs are effective at decreasing the number of vehicles running red lights. In one study in Virginia, red light cameras reduced the number of total drivers running red lights by 67 percent." Seems pretty effective to me.

At reducing that one behavior? Sure, but we also have to look at what other impacts it has.

We could reduce the number of people running red lights by 100% if we removed traffic lights, doesn't mean it's a good solution.

"When the Houston cameras were removed, angle accidents increased by 26 percent. However, all other types of accidents decreased by 18 percent. " So, a net increase in accidents. I can't make their numbers match up with their conclusion.

The next sentence is "Approximately one-third of all Houston intersection accidents are angle accidents. This suggests that the program’s drawbacks canceled out its benefits."

Say there are 100 accidents, 33 of which are from people running red lights.

A 26% decrease in red light running accidents results in 9 fewer accidents from running red lights. (.26*33=8.58)

An 18% increase in other accidents results in 12 more accidents from people slamming on their brakes. (.18*66=11.88)

So a net increase of 3 accidents.