Engineered for the most demanding applications, The SQ3TS Portable Traffic Signal is the global standard in work zone ready portable traffic signal systems. The SQ3TS Trailer-Mounted PTS is the most dynamic and dependable signal available today. With an industry-leading 100-mph wind load, and a 25-year design life, the SQ3TS Portable Traffic Signal is the temporary traffic control workhorse that you can rely on year after year.