"10. - Do red light cameras increase the risk of a rear-end collision?Some studies have reported that while red light cameras reduce front-into-side collisions and overall injury crashes, they can increase rear-end crashes. However, such crashes tend to be much less severe than front-into-side crashes, so the net effect is positive.
A study sponsored by the Federal Highway Administration evaluated red light camera programs in seven cities. 23 The study found that, overall, right-angle crashes decreased by 25 percent while rear-end collisions increased by 15 percent. Results showed a positive aggregate economic benefit of more than $18.5 million in the seven communities. The authors concluded that the economic costs from the increase in rear-end crashes were more than offset by the economic benefits from the decrease in right-angle crashes targeted by red light cameras.
Not all studies have reported increases in rear-end crashes. The review by the Cochrane Collaboration did not find a statistically significant change in rear-end injury crashes."
http://www.iihs.org/iihs/topics/t/red-light-running/qanda
Another from 2014
http://www.sciencedirect.com/science/article/pii/S2095756415302786 "The results of this study suggest that the use of red light running photo enforcement at signalized intersections on the whole is positive, as demonstrated by fatal crash reductions varying by between 4 percent and 48 percent. However, this research also found that while the use of red light running photo enforcement decreased injury crashes and slightly raised (by one percent) PDO crashes for angle crashes, it moderately increased injury and PDO crashes for rear-end crashes. Therefore, overall, the use of red light running photo enforcement at intersections in a large city can be considered to have slightly positive effects on reducing related crashes."
Closer to home - see
http://www.therecord.com/news-story/4309709-camera-ahead-hit-the-brakes-or-hit-the-gas-/ for a pile of local numbers that show net positive effects for red light cameras.