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The Traffic Detector module is able to detect the emergence of traffic jams on the road. The module generates a specific event and, in certain cases, notifies the operator.

A jam is detected if the average traffic speed is lower than a certain value and the overall road load is higher than a certain value for a specified time period.

To set up the jam detection parameters, do the following:

1. Open the Hardware tab in the System Settings window (1).
2. In the object tree on the left side of the Hardware tab, select the Traffic Detector object representing the Traffic Detector module to be set up. The settings panel of the selected object will open on the right side of the window (see Fig. 7.4—172).
   

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1. Image Added
2. In the Beginning time

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1. In the «Beginning time» field, enter for how long (in seconds) the jam conditions must be satisfied for the start of the jam to be detected (3).
2. In the «Average Average speed threshold» threshold field, enter the minimum average traffic speed which is still not considered to be a jam. When the average traffic speed remains lower than this value for a certain period of time, a traffic jam may be detected (if other conditions are satisfied) (4).
   The threshold is set in km/h.

3. In the

   «Road load threshold»

   Traffic jam threshold field, enter the maximum road load (in percent) which is still not considered to be a jam. When the road load remains higher than this value for a certain period of time, a traffic jam may be detected (if other conditions are satisfied).
   If the overall road load is lower than that specified, no traffic jam is detected.

   Info
   title Note.
   The road load parameter is calculated using the following formula:

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1. Image Added  , where T0 is the total of the time periods when vehicles were present in the loop detector zone, and T is the time period set in the Statistics update time field.

2. Click «Apply» Apply (6).

The jam start detection parameters are now set.