The U.S. National Highway Traffic Safety Administration (NHTSA) seeks comments on a technical report, “Effectiveness of LED Stop Lamps for Reducing Rear-End Crashes: Analyses of State Crash Data,” as part of the agency’s effort to “analyze the crash-reduction benefits of light-emitting diode (LED) stop lamps and LED center high-mounted stop lamps (CHMSL) using real-world crash data.” According to NHTSA, its research included laboratory experiments that suggest LED lamps were more beneficial than incandescent lamps at preventing rear-impact collisions. That analysis, however, does not apparently support a firm conclusion about whether LED stop lamps and LED CHMSL are more effective than incandescent lamps, NHTSA reports. Comments are requested by June 28, 2013. See Federal Register, February 28, 2013.