Vehicle Safety Inspections: Improved DOT Communication Could Better Inform State Programs, GAO-15-705: Published: Aug 25, 2015. Publicly Released: Aug 25, 2015: “According to officials GAO interviewed from 15 state vehicle safety inspection programs, these programs enhance vehicle safety; however, the benefits and costs of such programs are difficult to quantify. State officials told GAO that inspections help identify vehicles with safety problems and result in repair or removal of unsafe vehicles from the roads. For example, Pennsylvania state data show that in 2014, more than 529,000 vehicles (about 20 percent of vehicles in the state) failed inspection and then underwent repairs to pass. Nationwide, however, estimates derived from data collected by the Department of Transportation’s (DOT) National Highway Traffic Safety Administration (NHTSA) show that vehicle component failure is a factor in about 2 to 7 percent of crashes. Given this relatively small percentage as well as other factors—such as implementation or increased enforcement of state traffic safety laws—that could influence crash rates, it is difficult to determine the effect of inspection programs based on crash data. Studies GAO reviewed and GAO’s analysis of state data examined the effect of inspection programs on crash rates related to vehicle component failure, but showed no clear influence. Finally, many states do not directly track the costs of operating safety inspection programs because costs may be comingled with other inspection programs, such as emissions.”