Driver Feedback Sign - DFS003
Driver Feedback Sign DFS003
The City has a number of Driver Feedback Signs (DFS) installed around the city. These units collect data as traffic approaches them and in some cases may display a message or a speed that is being detected. Also, these units are radar based and can only track one vehicle at a time (strongest signal).
Due to the number of DFS installations combined with the volume of data collected, each DFS has its own dataset.
Details of how the data is collected by the DFS are as follows:
Data is accumulated and reported in 15 minute intervals
Vehicle speeds are captured/reported in speed intervals (bins)
Speed range/interval for the bins are determined by parameters/settings set for the DFS (Minimum/Maximum Speed Detection Setting)
Two speed values are recorded for every vehicle - a Highest Speed Detected and a Slowest Speed Detected (explaining why there are two vehicle counts)
The bins go from Bin 1 to Bin 10. Bin 1 can also be referred to a LO BIN and Bin 10 can also be referred to as HIGH BIN.
Things to note:
DFS devices are not to be used as or confused with traffic counters, as they are not.
DFS devices have a minimum detectable speed of approximately 6 km/hr.
DFS devices have a maximum (theoretical) detectable speed of approximately 225 km/hr.
DFS devices are programmable with different parameters that can also follow a timed schedule.
|Name||Socrata field name||Column name in ||Data type||Description|
|Maximum Speed for Bin Number||maximum_speed_for_bin_number||maximum_speed_for_bin_number||Number||The fastest detected speed travelled that corresponds to the Bin Number. Vehicles can travel less than or equal to this speed for it to be recorded for the Bin. NOTE: For Bin 10, the maximum detectable speed is approximately 225 KPH.|
|Minimum Speed for Bin Number||minimum_speed_for_bin_number||minimum_speed_for_bin_number||Number||The slowest detected speed travelled that corresponds to the Bin Number. Vehicles can travel equal to or faster than this speed for it to be recorded for the Bin. NOTE: For Bin 1, the minimum detectable speed is approximately 6 KPH.|
|Bin Number||bin_number||bin_number||Number||A value between 1 and 10, representing the data bin for which the vehicle count and the speed range is applicable. Bin 1 records the number of vehicles that were detected to travel in the slowest speed range and Bin 10 would be for the fastest speed range.|
|Log Timestamp||log_timestamp||log_timestamp||Calendar date||The Timestamp of when the data was recorded. The time interval between recordings is 15 minutes. Note: It is possible to not have a specific recording of data at a specific Timestamp. This can occur for a number of reasons; however, the data values are still for the 15 minute interval.|
|Vehicle Count for Log Interval||vehicle_count_for_log_interval||vehicle_count_for_log_interval||Number||The number of vehicles that were successfully detected and recorded within the specified parameters. This Vehicle Count is not and should not be correlated to a traffic volume count within the 15 minute interval.|
|Minimum Speed Detection Setting||minimum_speed_detection_setting||minimum_speed_detection_setting||Number||The lowest speed setting for the DFS Unit used to determine the speed ranges for each Bin.|
|Bin Over Speed Limit Flag||bin_over_speed_limit_flag||bin_over_speed_limit_flag||Number||A flag value that indicates the following: 0 - if the both the Minimum Speed and Maximum Speed for the Bin are below the Speed Limit 1 - if the Speed Limit is between the Minimum Speed and Maximum Speed for the Bin 2 - if the value of both the Minimum Speed and Maximum Speed for the Bin are greater than the Speed Limit|
|Location Description||location_description||location_description||Text||A brief / abbreviated description of the location where the DFS unit is located.|
|Site ID||site_id||site_id||Text||A unique ID assigned to the location for proper/accurate identification.|
|Direction||direction||direction||Text||The direction of travel of vehicles that are being detected by the DFS unit.|
|Vehicle Count at Highest Speed Detected||vehicle_count_at_highest_speed_detected||vehicle_count_at_highest_speed_detected||Number||The number of vehicles counted in the 15 minute time interval where the detected fastest speed of the vehicle was equal to or greater than the Minimum Speed for the Bin and is less than or equal to the Maximum Speed for the Bin.|
|Vehicle Count at Slowest Speed Detected||vehicle_count_at_slowest_speed_detected||vehicle_count_at_slowest_speed_detected||Number||The number of vehicles counted in the 15 minute time interval where the detected slowest speed of the vehicle was equal to or greater than the Minimum Speed for the Bin and is less than or equal to the Maximum Speed for the Bin.|
|Speed Range for Bin||speed_range_for_bin||speed_range_for_bin||Number||A calculated value based on (Maximum Speed Detection Setting and Minimum Speed Detection Setting). NOTE: - For Bin 1, the minimum detectable speed is approximately 6 KPH. - For Bin 10, the maximum detectable speed is approximately 225 KPH.|
|Maximum Speed Detection Setting||maximum_speed_detection_setting||maximum_speed_detection_setting||Number||The fastest speed setting for the DFS Unit used to determine the speed ranges for each Bin.|
|Speed Unit of Measure||speed_unit_of_measure||speed_unit_of_measure||Text||The Speed Unit of Measure. Note: The usual setting is KPH but could also be MPH.|
|Row ID||row_id||row_id||Text||System generated ID to eliminate the possibility of duplicate data.|
|Speed Limit||speed_limit||speed_limit||Number||The Speed Limit setting for the DFS unit. Note: This may not be the enforceable speed for the roadway.|