Define "preemption" in traffic signaling.

Preemption in traffic signaling refers specifically to a system that alters signal operation to give priority to emergency vehicles. This system is designed to improve the response time of emergency services such as fire trucks, ambulances, and police vehicles. When an emergency vehicle approaches an intersection, the preemption system can change the traffic signal to green for the emergency vehicle while turning the other signals red. This allows the emergency vehicle to pass through the intersection safely and quickly, reducing delays that could hinder their ability to respond to urgent situations.

This distinct function of preemption is critical in urban planning and traffic management, as it prioritizes public safety and facilitates faster emergency response. Other systems, such as those that manage routine traffic flow, pedestrian crossing times, or rush hour traffic, do not specifically focus on giving priority to emergency vehicles in the same manner that preemption does. Understanding preemption and its role in traffic signaling is essential for signal technicians as they design, implement, and maintain traffic management systems.