SmartSensor HD - Interprovincial Traffic Services

CHAPTER 6 • LANE SETUP 69Adjustment tool (see Figure 6.14). The drop-down list allows you to adjust lane volume,detection, speed, length, extension time or direction protection. To return to default settings,select Set Defaults from the drop-down list and click the OK button. Each laneadjustment is independent of other lanes; setting one lane back to defaults using the SetDefaults option will not affect the other lanes.Figure 6.14 – Lane Adjustment Window˽˽˽˽Volume – This setting should be adjusted first when a problem with count accuracy isobserved. The default is 100%. This setting adjusts the aggressiveness of traffic radarspecificalgorithms and is not an arbitrary scale factor. By increasing the percentage by10% to 15%, you are likely to begin to increase the number of detection, and by decreasingthe percentage by 10% to 15%, you are likely to begin to decrease the numberof detections. Small adjustments of only 1% or 2% may actually have no impact on thedetection performance. Practical values for this setting are typically between 20% and190%. If the volume lane adjustment is below 20%, many detections in that lane willprobably be missed; if it is set greater than 190%, many false detections will probablyoccur.Detection – Raises or lowers the threshold for detecting vehicles. The sensor automaticallydetermines where the threshold will be placed, and then adds in this tuningparameter. Entering a larger number will result in fewer detections; entering a smallnumber will result in more detections. The default is 0 dB.NoteChanging the detection tuning parameter can drastically effect vehicle detection.˽˽˽˽˽˽Speed – Raises or lowers the speed calculated for all vehicles in each lane. The sensorcalculates the speed, and then multiplies the speed by this factor. The default is 100%.Length – Increases or decreases the length for all vehicles in each lane. The sensorcalculates the length and then adds the length factor. The default is 0 (feet or metersdepending on sensor units used).Extension Time – Changes the extension time, which the sensor uses to prevent vehicleswith trailers from being broken into multiple detections. A longer extensiontime will prevent this, but can lead to multiple vehicles being merged into a single