MPH Industries' Speed Monitor Full Matrix Trailer, developed by MPH in partnership with LiteSys, Inc., combines the versatility of a variable message trailer with the speed reducing capability of a speed display trailer. Working together, the companies have designed a trailer that has been designed for law enforcement, combining the high reliability of LiteSys displays and the speed accuracy of MPH radars. The Speed Monitor Full Matrix Trailer is available in two-line and three line versions. All Full Matrix Trailers come with MPH’s directional radar and can display speeds and/or messages.