Headquartered in Dixon, Illinois, with a nationwide customer service network, John Thomas, Inc. (JTI) has served the roadway ... safety industry for more than 25 years. From our state-of-the-art manufacturing facility, we proudly design and manufacture the trusted ADDCO PTS-2000 line of portable traffic signals - the most advanced and easiest-to-deploy portable traffic signals available. JTI also manufactures the Dura-Curb SEVERE USE raised curb separator system and the SpeedSafe Radar Speed Trailer. In addition to the innovative products we manufacture, JTI represents leading manufacturers such as Energy Absorption Systems, MH Corbin, Safe-Hit, and more. read more