Emergency Vehicle Preemption

Once the route is calculated the route shall be provided to the dispatch function.
The center shall calculate emergency vehicle routes, under center personnel control, based on the collected traffic and road conditions information..
The center shall collect current traffic and road condition information for emergency vehicle route calculation.
The center shall provide the capability for digitized map data to act as the background to the information presented to the emergency system operator.
The center shall provide the capability to request special traffic control measures, such as signal preemption, from the traffic management center to facilitate emergency vehicle progress along the suggested route.
The center shall receive information on the location and status of traffic control equipment and work zones along potential emergency routes.
The center shall request and receive ingress and egress routes or other specialized emergency access routes from the traffic management center.

The emergency vehicle shall send requests to traffic signal control equipment at the roadside to preempt the signal.
The emergency vehicle shall send the current en route status (including estimated time of arrival) and requests for emergency dispatch updates.
The emergency vehicle shall send the vehicle’s location, speed and direction to other vehicles in the area.
The emergency vehicle, including roadway service patrols, shall send the vehicle's location and operational data to the center for emergency management and dispatch.
The emergency vehicle, including roadway service patrols, shall track its current location.

The field element shall notify controlling traffic management center and maintenance center that the signal timing has changed based on a signal preemption/priority request to help those centers determine whether a fault detected at the signal is a true m
The field element shall respond to requests for indicator (e.g., signal) preemption requests from emergency vehicles at intersections, pedestrian crossings, and multimodal crossings.

The center shall receive inputs from emergency management and transit management centers to develop an overall status of the transportation system including emergency transit schedules in effect and current status and condition of the transportation infra
The center shall support an interface with a map update provider, or other appropriate data sources, through which updates of digitized map data can be obtained and used as a background for traffic incident management.

The center shall collect traffic signal controller fault data from the field.
The center shall collect traffic signal controller operational status and compare against the control information sent by the center.
The center shall implement control plans to coordinate signalized intersections, under control of center personnel, based on data from sensors and surveillance monitoring traffic conditions, incidents, emergency vehicle preemptions, the passage of commerc
The center shall remotely control traffic signal controllers.

Source	Architecture Flows	Destination
DDOT TMC	signal control data	DDOT Traffic Signals
DDOT Traffic Signals	request for right-of-way	DDOT TMC
DDOT Traffic Signals	signal control status	DDOT TMC
FEMS Fire-EMS Dispatch	suggested route	FEMS Fire-EMS Vehicles
FEMS Fire-EMS Vehicles	local signal preemption request	DDOT Traffic Signals
FEMS Fire-EMS Vehicles	emergency vehicle tracking data	FEMS Fire-EMS Dispatch

SDO	Document ID	Title	Type
AASHTO/ITE/NEMA	View List	NTCIP Center-to-Field Standards Group	Group
ASTM	View List	Dedicated Short Range Communication at 915 MHz Standards Group	Group
ASTM/IEEE/SAE	View List	Dedicated Short Range Communication at 5.9 GHz Standards Group	Group
AASHTO/ITE/NEMA	NTCIP 1201	Global Object Definitions	Message/Data
AASHTO/ITE/NEMA	NTCIP 1202	Object Definitions for Actuated Traffic Signal Controller (ASC) Units	Message/Data
AASHTO/ITE/NEMA	NTCIP 1210	Field Management Stations (FMS) - Part 1: Object Definitions for Signal System Masters	Message/Data
AASHTO/ITE/NEMA	NTCIP 1211	Object Definitions for Signal Control and Prioritization (SCP)	Message/Data
AASHTO/ITE/NEMA	NTCIP 1214	Object Definitions for Conflict Monitor Units (CMU)	Message/Data

Stakeholder	Roles and Responsibilities
DDOT Transportation Operations Administration
DDOT Transportation Operations Administration	Provide signal preemption for emergency vehicles.
FEMS - District Fire-Emergency Medical Service
FEMS - District Fire-Emergency Medical Service	Coordinate with the local traffic operations centers for traffic signal pre-emption.

District of Columbia ITS Architecture