SmartSensor HD - Interprovincial Traffic Services

CHAPTER 7 • DATA SETUP AND COLLECTION 83Figure 7.11 – ApproachesApproaches are used in interval data and will contain the same type of information thateach lane would. An advantage to using approaches rather than post-processing individuallane data is that approaches gather aggregate data. An example of when this would be usefulis in determining speed limits. Using approaches, the sensor could find the 85th percentilespeed for all cars in all lanes going one direction, rather than finding it for each lane.When lanes of differing directions are used, the absolute value of the speed is used to calculateall speed fields. Also, the Right and Wrong direction bins will contain the total numberof vehicles traveling with the user-defined direction of the corresponding lanes in the Rightbin, and all others in the Wrong bin.To create an approach, select the desired lanes and click thebe named to coincide with the purpose of the approach.button. Each approach canDate and TimeClick the Date and Time button on the Data Collection window to access the Date &Time window (see Figure 7.12).