Gallagher is co-author of a paper posted to Social Science Research Network, commonly known as SSRN, based on an analysis of thousands of collisions over a 12-year span reported by the Texas Department of Transportation. Researchers focused on data while red-light cameras were operating and again after they were removed (by voter referendum) in Houston—and drew on similar data from Dallas, which still has its red-light camera program.
In Houston, the installation of the cameras led to 18 percent more non-angle accidents, with an estimated 28 percent jump in these collisions in a combined Houston-Dallas data sample, researchers found.
While removing the cameras in Houston caused 26 percent more “angle” accidents—such as T-bone collisions, considered among the most dangerous—it’s likely the cameras actually led to more accidents overall, since there are more non-angle accidents, researchers concluded.