KIPDA Regional ITS Architecture

Element Expanded Functional Requirements: INDOT Variable Speed Limit 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 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: Roadway Variable Speed Limits
  1. The field element shall monitor traffic and environmental conditions along the roadway.
  2. The field element shall autonomously calculate and set variable speed limits based on current conditions by lane.
  3. The field element shall receive commands from the controlling center that establish speed limits by lane.
  4. The field element shall display the current speed limits per lane to drivers.
  5. The field element shall display additional information such as basic safety rules and current traffic information to drivers.
  6. The field element shall collect operational status of the variable speed limit field equipment and report the operational status to the controlling center.
  7. The field element shall monitor and report faults to the controlling center.