The Insurance Institute for Highway Safety is releasing a study Tuesday that reports that the cameras have reduced fatal crashes by 24 percent in 14 large cities where the devices were introduced between 1996 and 2004.
Institute President Adrian Lund says the study shows red light cameras work, crediting them with saving hundreds of lives.
National Motorists Association Executive Director Gary Biller disputes the institute's finding that the cameras have reduced deaths. It cites previous studies that found that the cameras increase crashes. He says there are cheaper alternatives to cameras, such as lengthening yellow lights or improving sight lines.