How Traffic Signal Preemption Devices Improve Intersection Efficiency and Safety

A Traffic Signal Preemption Device is a critical component in modern urban traffic management, allowing designated vehicles to alter the normal operation of traffic lights for improved speed and safety. These devices are commonly used by emergency services, public transit, and railway systems to gain priority at intersections.

Preemption systems typically rely on transmitters installed in vehicles and receivers at signalized intersections. When a vehicle equipped with a transmitter approaches, it sends a signal—often via infrared, GPS, or radio frequency—to a receiver connected to the traffic signal controller. This signal prompts the traffic light to change, usually granting an early green or holding an existing green light to let the priority vehicle pass through safely and without delay.

Deployment can vary widely. Some systems are activated remotely from dispatch centers or fire stations, while others function automatically based on vehicle proximity. Integration with broader network management systems—such as those for trains or public transportation—ensures coordinated signal control across multiple intersections.

For a preemption system to function, the traffic signal must be equipped to recognize and respond to the specific activation signals. If not properly configured, the system will ignore the incoming request and continue operating in standard cycle mode.

Advanced preemption devices like those used with the EMTRAC system can also manage multiple requests simultaneously. Optional in-vehicle control displays alert drivers when other priority-equipped vehicles are nearing the same intersection, helping to avoid conflicts and maintain smooth traffic flow.

Contact:

visit: https://www.emtracsystems.com/ 

location: Manufactured By STC, Inc. 1201 W. Randolph St, McLeansboro, IL 62859

phone: Richard D’Alessandro: (214) 607–0100

Fax: (214) 607–0105

Email: info@emtracsystems.com

 


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