Uses digital wave radar for traffic detection, detect vehicles speed, size and how long it occupies an area. CDOT uses this device for various applications, most commonly traffic management. It works with the Toll Tag Identifiers/Wavetronix in calculating the flow of traffic in a specific stretch of roadway. This data is used to calculate trip travel times and alerts the Colorado Traffic Management Center of a slow section of roadway so it can advise of traffic problems. These devices are also used for traffic signal detection to indicate a vehicle is waiting for a green light. This device is also used for counting vehicle on a stretch of roadway for transportation planning. It records number of vehicles, types of vehicles (Semi-trucks, cars, box trucks, etc.), and if vehicles are slow in a stretch of roadway on a regular basis.