Wavetronix SmartSensor HD (101-0415) - User Guide Uživatelský manuál stáhnout pdf (Strana 71)

70 CHAPTER 7  DATA

Figure 7.4 – Approaches

Approaches are used in interval data and will contain the same type of information that

each lane would. An advantage to using approaches rather than post-processing individual

lane data is that approaches gather aggregate data. An example of when this would be useful

is in determining speed limits. Using approaches, the sensor could nd the 85th percentile

speed for all cars in all lanes going one direction, rather than nding it for each lane.

When lanes of diering directions are used, the absolute value of the speed is used to calcu-

late all speed elds. Also, the Right and Wrong direction bins will contain the total number

of vehicles traveling with the user-dened direction of the corresponding lanes in the Right

bin, and all others in the Wrong bin (see the Direction section below).

To create an approach, select the desired lanes and click the button. Each approach can

be named to coincide with the purpose of the approach.

Direction

e direction bins are congured as Right and Wrong. is refers to whether vehicles in a

given lane are traveling in the direction the lane is congured (to change lane direction, use

the lane window in the Conguration screen). is is most useful in the case of reversible

lanes, where trac goes dierent directions in a lane depending on the time of day. In this

case, for part of the day the vehicles would be counted in the Right bin; during the other

part of the day, the vehicles would be counted in the Wrong bin.

To enable direction bins, check the Direction checkbox.

If volume = 0, speed = 0

If during an interval, the volume is zero (meaning no cars were detected), SSMHD will re-

port the average speed of the last interval. If you would like the intervals that are reporting

zero volume to report speeds as zero, simply check the If volume = 0, speed = 0 checkbox.

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Wavetronix SmartSensor HD (101-0415) - User Guide Uživatelský manuál Strana 71