9.3.3.3: Manage Vehicle Speed on Roadway

This process shall be responsible for monitoring the speeds of vehicles, calculating optimal speed limit by lane, and adjusting speed limits to create more uniform speeds and increase safety. The process shall receive inputs from devices that monitor the speed of individual vehicles as well as from devices that monitor the speed of the flow of traffic. The process shall be responsible for the control of the devices that monitor individual vehicle speed. The process shall receive an input from environmental sensors at the roadway. The process shall assess, using the environmental conditions as an input, whether the speed exceeds the speed limit (such as in a work zone) or is excessive given the environmental conditions. The process shall pass speed measurements, variable speed limits, and other advisory information to other processes for display on a dynamic message sign or in-vehicle. The process shall be capable of notifying the Enforcement Agency when vehicle speeds are in excess of the posted speed limit or are creating an unsafe condition based upon the current environmental conditions. The process shall provide safe speed threshold parameters based on environmental conditions, traffic conditions, and vehicle characteristics to another process for determining whether driver safe speed advisories should be issued. The process shall receive an input from the speed enforcement process indicating speed violations that have been identified.

This process is associated with the Traffic Management Center physical object.

This process is associated with the following functional objects:

• TMC Speed Warning
• TMC Variable Speed Limits

This process is associated with the following data flows:

• speed_sensor_control_from_traffic_personnel
• tec-enforcement_request_from_traffic
• roadway_info_variable_speed_limit_data
• variable_speed_limit_data_for_signage
• variable_speed_limit_control_from_traffic_personnel
• env_sensor_data_for_traffic_speed_monitoring
• speed_data_for_traffic_display
• speed_data_for_traffic_speed_monitoring
• speed_data_for_traffic_status
• speed_sensor_control_from_traffic
• speed_sensor_log_for_traffic
• speed_violation_notification_for_traffic
• variable_speed_limit_control
• variable_speed_limit_status
• incident_data_for_speed_management
• roadside_speed_management_status
• speed_management_roadside_control
• device_control_coordination
• traffic_regulation_information_for_personal_device
• ftra-traffic_regulation_information
• speed_management_information_for_travelers