Emergency Vehicle Preemption (EVP)

EMTRAC First Response Photo

EMTRAC EVP in the Field

The EMTRAC system enables first-response vehicles to request preemption through equipped intersections. The expansive communication range also enables city agencies to customize each intersection approach so equipped vehicles can request preemption as early as necessary.

Studies on the impact of EMTRAC EVP have discovered the following benefits:

Coquitlam Fire Department Using EMTRAC EVP

Coquitlam Fire/Rescue

Sunnyvale, California: After installing the EMTRAC system, the average emergency vehicle travel time decreased 20 percent in one fire district and 25 percent in another.

Coquitlam, British Columbia: Average emergency-vehicle response times decreased between 20 to 25 percent.

Novato, California: After installing the EMTRAC system on all fire engines and ambulances, response times improved 45 percent.

  • Satellite and inertial-based positioning system uses latest technology to ensure accuracy and reliability.
  • Frequency-hopping spread spectrum radio signal has superior range and utilizes AES encryption for security.
  • Priority requests can be custom tailored to allow different responses to each vehicle.
  • Precise control of priority-detection zones using EMTRAC system software enables customization for each specific area in the city.
  • Line-of-sight communication is not necessary to ensure priority requests are received.
  • Detailed logs and reports show vehicle and intersection activity in multiple formats.
  • Preemption-request points can be based on time-of-day to allow for earlier preemption during peak-period rush hours.
  • EVP requests may be sent to multiple intersections simultaneously to help clear gridlock from downstream and side-street intersections.
  • Communication signal utilizes secure AES encryption.

Information Sheets

EMTRAC First-Response AVL

The EMTRAC Central Monitoring System enables first-response dispatch and department personnel to remotely monitor vehicle progress and activity in real time.

EMTRAC Central Monitor - Automatic Vehicle Location System for First-Response Agencies

EMTRAC Central Monitor Interface

With EMTRAC AVL (automatic vehicle location), equipped vehicles automatically transmit location and activity data to network-connected EMTRAC detectors in wayside cabinets. This data is displayed on central-workstation monitors, showing vehicle movement on a map in real-time. The data is also recorded in detailed logs for later review.

The components used for the AVL system are the same as those used for basic EMTRAC EVP/TSP functionality, making it both a simple and cost-effective way to implement an accurate and reliable AVL system.

  • Automatically locate specific vehicles and intersections with the click of a mouse.
  • Connect to intersection controller switches to enable display of current signal status on map.
  • Automatically download and save activity logs from onboard VCUs while vehicles are at station.
  • Configure system to automatically generate reports, which are automatically emailed and archived at specified intervals.
  • Automatically alert designated personnel—as specified events occur.
  • View logs, and generate reports, that show changes in connectivity status to help identify possible network issues.
  • Interface with optional EMTRAC components, such as the onboard Control Head that alert the driver if priority requests are denied by the controller.
  • Timeliness: View vehicle progress that is updated on the map every one to four seconds.
  • Ease of Installation: Central Monitoring System interfaces with existing EMTRAC TSP and EVP system components, requiring minimal additional equipment.
  • Expandability: Agencies can upgrade their existing EMTRAC system with minimal effort, adding capabilities as schedules and budgets allow.
  • Flexibility: Customize permissions for individual or group users and alter reporting responses to meet specific agency requirements.
  • Accuracy: The EMTRAC system utilizes precision satellite and inertial positioning to ensure exact vehicle location reporting—even in unfavorable urban environments.
  • Security: Frequency-Hopping Spread Spectrum radio signal has superior range and utilizes AES encryption.

Information Sheets

Dual 'Optical/RF' Detection

Many agencies find themselves maintaining outdated signal-priority systems due to the expense involved with a full-system replacement. Upgrading from a legacy optical system to an advanced GNSS/RF system had previously meant replacing all vehicle and wayside equipment. This is no longer the case.

EMTRAC Dual-System Signal Priority Detection for Emergency Vehicle Preemption (EVP)

EMTRAC Dual-System Signal-Priority Detection

The EMTRAC system can detect optical signals from all major opticalopticalopticaloptical brands, as well as from the more-advanced EMTRAC GNSS/RF system. This capability enables cities to upgrade selected optical components while leaving other components in place until budgets allow for expanded upgrades.

EMTRAC Priority Detectors support up to 16 inputs, allowing for priority calls to be received for multiple phases from both optical and EMTRAC GNSS systems. Detectors plug into the same input files as optical phase selectors (or may be housed in shelf-mount enclosures in NEMA cabinets). Priority Detectors are capable of connecting to optical sensors while simultaneously connecting to omnidirectional antennas for the RF-based EMTRAC system.

  • Support for up to 16 inputs and outputs allows for detection of multiple phase types (such as traffic and pedestrian phases, signal-state confirmation, etc).
  • Detailed event logging enables agency personnel to view system-specific logs or merged logs—allowing for easy evaluation and comparison.
  • Dual-card Priority Detector plugs into the same card files as optical systems.
  • Ethernet and USB ports on Priority Detector facilitate local and remote configuration, programming, firmware upgrades, and log retrieval.
  • Priority Detector is compatible with NEMA, 170/2070, Caltrans, ITS, and custom cabinets.
  • Cost Effective: Decrease upgrade costs by replacing vehicle and wayside units as budgets allow.
  • Expandable: Add new functionality and system components without having to replace installed EMTRAC equipment. Expand the system later to take advantage of advanced features, such as adaptive Transit Signal Priority (TSP) and real-time centralized monitoring (AVL).
  • Reliable: Wireless communication is not hampered by adverse weather or urban-canyon conditions, with typical range no less than 3,000 feet.
  • Low Maintenance: Reduce or eliminate the need for repeated cleaning of wayside optical components.

Range, Reliability, and Precision

EMTRAC Emergency Vehicle Preemption

EMTRAC EVP at over 3,600 ft. from Intersection

The EMTRAC system offers unmatched transmission range and signal reliability. Under typical urban RF-propagation conditions, the effective range of communication from vehicle to equipped intersection is 3,500 feet (over 1,000 meters). For applications requiring additional range, transmission signals may be relayed via wayside equipment to extend communication distance.

EMTRAC equipment is also equipped with the most advanced satellite (concurrent GPS and GLONASS) and inertial technology, providing 100-percent coverage and positioning for equipped vehicles.

Automatic Logs & Updates

The EMTRAC Interrogator System enables first-response agencies to automatically download activity logs from—and upload firmware and database updates to—equipped vehicles.

EMTRAC Interrogator System

Automatic Transfer of Activity Logs at Fire Station

The EMTRAC Interrogator System can be used at fire stations, municipal-vehicle garages and lots, as well as maintenance facilities.

As equipped vehicles return to the station or garage, the EMTRAC Interrogator System utilizes secure frequency-hopping spread spectrum radio to quickly download data logs from onboard EMTRAC units. This data is forwarded to a server running the EMTRAC Central Monitor software, where the data may be viewed by designated personnel.

  • Automatic Retrieval and Update: Wirelessly download activity logs from EMTRAC components, and automatically upload firmware or database updates to units that have not yet received the update.
  • Auto-Notifications: The EMTRAC software may be configured to email periodic activity logs to specified agency personnel.
  • System Monitoring: The EMTRAC software enables agency personnel to monitor connection status and history (between server and Interrogator as well as between Interrogator and EMTRAC components), and current RF signal strength.
  • Communication Stability: Data is not lost in cases of network interruption, and data transfers resume from the point of interruption.
  • Low Profile: For external connections, the EMTRAC Interrogator Kit requires only 120 VAC power and Ethernet. All communication with EMTRAC vehicle components is performed wirelessly.
  • Limitless Memory: By transferring activity logs to the system server, onboard EMTRAC components are able to continually store new log entries.
  • Timeliness: High communication rates enable fast data transfers, while offering many options for where to mount the Interrogator—such as near refueling or washing stations.
  • Flexibility: The EMTRAC Interrogator may be mounted on wall, pole, or other structure, and multiple antenna options allow for reliable communication, even in high-interference environments.

Information Sheets