emergency_vehicle_sign_preemption

This data flow is sent from the Manage Emergency Services function to the Manage Traffic function and contains data necessary for an emergency services vehicle to have a message output giving it preemption at an indicator that is a particular dynamic message sign (DMS) or fixed message sign that has a transit priority message that can be displayed. The data flow is sent directly from the emergency vehicle to the sign controller and may consist of either a single character that will enable the sign controller to output the correct message from its list of known messages, or a string of characters for a controller driving a DMS.

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Associated PSpecs/Terminators