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9.3.3.1: Collect Vehicle Speed

This process shall be responsible for collecting the speed of individual vehicles. The process shall accept inputs to establish speed limits and thresholds for each lane and direction of roadway, control the speed monitoring device and return data and operational status (state of the sensor device, configuration, and fault data) to the controlling process, and to another process for repair if deemed necessary. The process shall pass the speed measurement onto other roadside devices for display to drivers, or provide individual speed information to another process for speed enforcement. The process shall receive safe speed threshold parameters based on environmental conditions, work zone activity or other reduced speed zone needs (schools, hospitals, residential area) and vehicle characteristics, and send a safe speed advisory to another process for display to drivers if the threshold has been exceeded. The process shall aggregate speed data to provide periodic logs of the vehicle speed.

This process is associated with the ITS Roadway Equipment physical object.

This process is associated with the following application objects:

• Roadway Basic Surveillance
• Roadway Environmental Monitoring
• Roadway Speed Monitoring and Warning
• Roadway Traffic Gap Assist
• Roadway Variable Speed Limits
• Roadway Warning
• Roadway Work Zone Safety

This process is associated with the following data flows:

• dms_variable_speed_data_from_roadway - Out
• env_sensor_data_for_variable_speed_limits - In
• f_other_rw_variable_speed_limit_data - In
• fec-speed_sensor_control - In
• individual_vehicle_speed - Out
• individual_vehicle_speed_for_display - Out
• individual_vehicle_speed_for_signage - Out
• road_user_warning_speed_conditions - In
• signage_variable_speed_data_from_roadway - Out
• speed_sensor_control_from_m_and_c - In
• speed_sensor_control_from_traffic - In
• speed_sensor_equip_status_for_m_and_c - Out
• speed_sensor_log_for_m_and_c - Out
• speed_sensor_log_for_traffic - Out
• speed_sensor_status - Out
• speed_sensor_status_for_m_and_c - Out
• speed_warning_for_display - Out
• speed_warning_for_signage - Out
• t_other_rw_individual_vehicle_speed_to_dms - Out
• t_other_rw_individual_vehicle_speed_to_signage - Out
• t_other_rw_speed_warning_to_dms - Out
• t_other_rw_speed_warning_to_signage - Out
• t_other_rw_variable_speed_limit_data - Out
• t_other_rw_variable_speed_limit_data_to_signage - Out
• tec-speed_sensor_status - Out
• traffic_sensor_data_for_variable_speed_limits - In
• variable_speed_limit_control - In
• variable_speed_limit_equip_status_for_m_and_c - Out
• variable_speed_limit_status - Out
• vehicle_speed_data_from_roadside - In