Maui Regional ITS Architecture

Element Expanded Functional Requirements: HDOT-AIR-M Field Devices


Functional Area: Roadway Basic Surveillance
  1. The field element shall collect, process, digitize, and send traffic sensor data (speed, volume, and occupancy) to the center for further analysis and storage, under center control.
  2. The field element shall collect, process, and send traffic images to the center for further analysis and distribution.
  3. The field element shall collect, digitize, and send multimodal crossing and high occupancy vehicle (HOV) lane sensor data to the center for further analysis and storage.
  4. The field element shall return sensor and CCTV system operational status to the controlling center.
  5. The field element shall return sensor and CCTV system fault data to the controlling center for repair.
Functional Area: Roadway Signal Controls
  1. The field element shall control traffic signals under center control.
  2. The field element shall respond to pedestrian crossing requests by accommodating the pedestrian crossing.
  3. The field element shall provide the capability to notify the traffic management center of pedestrian calls and pedestrian accommodations.
  4. The field element shall report the current signal control information to the center.
  5. The field element shall report current preemption status to the center.
  6. The field element shall return traffic signal controller operational status to the center.
  7. The field element shall return traffic signal controller fault data to the center.
  8. The field element shall report current transit priority status to the center.
Functional Area: Roadway Traffic Information Dissemination
  1. The field element shall include dynamic messages signs for dissemination of traffic and other information to drivers, under center control; the DMS may be either those that display variable text messages, or those that have fixed format display(s) (e.g. vehicle restrictions, or lane open/close).
  2. The field element shall include driver information systems that communicate directly from a center to the vehicle radio (such as Highway Advisory Radios) for dissemination of traffic and other information to drivers, under center control.
  3. The field element shall include pedestrian information systems under center control (e.g. warning pedestrians of a potential hazard, or providing mandatory instructions as to the availability of pedestrian access).
  4. The field element shall provide operational status for the driver information systems equipment (DMS, HAR, etc.) to the center.
  5. The field element shall provide fault data for the driver information systems equipment (DMS, HAR, etc.) to the center for repair.
Functional Area: Field Barrier System Control
  1. The field element shall activate barrier systems for transportation facilities and infrastructure under center control. Barrier systems include automated or remotely controlled gates, barriers and other systems that manage entry to roadways.
  2. The field element shall return barrier system operational status to the controlling center.
  3. The field element shall return barrier system fault data to the maintenance center for repair.
  4. The field element shall receive requests for access from approaching vehicles using field-vehicle communications and validate and authenticate the requests.
  5. The field element shall grant access only to qualified vehicles.
  6. The field element shall communicate access permission status and access instructions to approaching vehicles using field-vehicle communications.
 

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