If multiple preempts are set to the same priority level, how are they served?

When multiple preempts are set to the same priority level, they are served on a first come, first serve basis. This means that the preempt that was activated first will take precedence over others that are activated later, regardless of their source or request time. This system effectively manages the flow of traffic signals in situations where multiple emergency vehicles might need to interrupt the normal traffic cycle simultaneously.

This method helps maintain a fair and organized response to emergencies, ensuring that the first request is honored, preventing confusion or conflicts between multiple emergency vehicles attempting to gain right of way. The prioritization is clear and enforceable, ensuring that emergency responses are executed efficiently following the established protocols in traffic management systems.

The other options imply methods of prioritization that do not necessarily consider the order of activation, which could lead to inefficiencies or confusion in emergency response situations.