What happens when two apparatus equipped with preemptive devices approach the same intersection from different directions?

When two apparatus equipped with preemptive devices approach the same intersection from different directions, the normal operation of traffic lights can be altered to prioritize the emergency vehicles. In this situation, the preemptive device on one of the apparatus communicates with the traffic signal system and grants that vehicle a green light, allowing it safe passage through the intersection.

The intent of the system is to mitigate the risk of collisions and ensure that emergency responders can reach their destinations as quickly as possible. Therefore, as one apparatus receives the green light, it enables it to proceed through the intersection while other traffic is halted, which is why this scenario is designed to prioritize one vehicle over the other. This protocol supports the critical need for rapid response times in emergency situations.

While it may seem possible that both vehicles could receive a green light simultaneously, traffic controls are generally designed to prevent such occurrences to avoid dangerous situations at intersections.