people with epilepsy?
Strobes are installed within a red signal lens at intersections at which a signal is not expected, such as after a long stretch of a high-speed highway with no signals. The strobe light is there to call attention to the red light. In some instances a stand-alone red signal with a strobe is used. The strobes are either linear across the red lens or circular around its edge. The frequency of the strobe light is much less than that which is required to trigger a response in people with epilepsy, so it is not a danger to them. States where these are or have been found include AL, AZ, IL, IN, FL, MD, MA, MI, MN, MS, NJ, NY (especially on NY 17), NC, OH, PA, TN, TX, and VA. VT and WV have used strobes in flashing yellow signals, with WV applying them to both the stand-alone beacon and the yellow warning sign supplement. Aug 6, 2004 11.
