Municipal Vehicle Signal Priority

Vehicles with the EMTRAC system transmit a priority request to equipped intersections when passing through geographic detection zones. The intersection-control cabinet contains an EMTRAC Priority Detector, which relays the priority-request to the signal controller.

EMTRAC is completely automatic and requires no driver interaction. In addition, EMTRAC can be configured to allow priority control based on time of day, route schedule, material levels, or other factors.

Snowplows Request Traffic-Signal Priority
  • Map display of city streets in multiple map types for any number of vehicles.
  • Display route progress in real time. As vehicles complete portions of their assigned routes, the completed streets are indicated on the map.
  • Generate detailed status and activity reports, save the reports to open later, or export them as spreadsheet files.
  • Log vehicle “events” by user-definable types. For example, the real-time activity log can be configured to display only requests for signal priority.
  • Monitor task-specific diagnostics (such as salt/chloride levels for snow plows or load amounts for waste collection trucks) to better plan for needed stops.
  • Monitor critical engine diagnostics (such as fluid levels) to anticipate potential maintenance issues.
  • Flexibility: Customize EMTRAC for your city by configuring the way vehicles and intersections respond based on any number of factors. EMTRAC also easily integrates with existing AVL and CAD systems.
  • Reliability: Wireless communication is not hampered by adverse weather conditions, and the range is typically no less than 3,000 feet, requiring relatively few detector units.
  • Timeliness: Improve clearing times by enabling designated vehicles (such as snow plows) to request priority through signalized intersections.
  • Security: Maintain secure communication through the ISM radio band with AES-encrypted radio.
  • Fuel Efficiency: Reduce cross-city runs by identifying the closest vehicles needed for new assignments. Reduce stops and starts, as well as unnecessary idling, by enabling certain vehicles to request signal priority.
  • Low Maintenance: Interface with existing in-ground loop detectors without requiring new loops or costly installations.

Optional System Capabilities

Track Vehicle Progress & Material Levels

The EMTRAC system also enable municipal vehicles to report location data to operations centers. Agency personnel can monitor vehicle locations, diagnostics, and supply levels in real time. Vehicles can also be quickly sent to new routes or locations while monitoring personnel track completed routes and assignments.

As EMTRAC-equipped vehicles report their locations, a central workstation (equipped with EMTRAC software) displays their current locations on city maps. Monitoring personnel can determine the location of a specific vehicle with the click of a button. They can also choose to display only vehicles belonging to a specific department, making it easier to locate and re-route vehicles.


EMTRAC System video demonstrations of EMTRAC System capabilities, including Emergency Vehicle Preemption (EVP), Transit Signal Priority (TSP), transit rail safety, vehicle detection, and signal management.

Intelligent Signal Management  -  1:13