Wavetronix SmartSensor HD (101-0415) - User Guide - Manual (Page 65)

64 CHAPTER 6 • LANES
˽ Speed – Raises or lowers the speed calculated for all vehicles in each lane. The sensor
calculates 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 sensor
calculates the length and then adds the length factor. The default is 0 (feet or meters
depending on sensor units used). Since the occupancy metric that is reported in the
interval data is calculated using length, a change in the length tuning parameter will
also change the occupancy that is reported. See page 69 for the equation that is used to
calculate occupancy and for a more detailed explanation.
˽ Extension Time – Changes the extension time, which the sensor uses to prevent ve-
hicles with trailers from being broken into multiple detections. A longer extension time
will prevent this, but can lead to multiple vehicles being merged into a single detection.
The sensor automatically determines the extension time and then multiplies by this
factor. The default value is 100%.
Note
There must be a minimum of 5.5 ft (1.68 m) between vehicles in order for them to be
detected as separate vehicles. This separation requirement may increase as vehicle
speeds increase.
˽ Direction Protection – Allows you to turn Direction Protection on or off. When Di-
rection Protection is on (default), data will be shown only for vehicles that are going
in the direction set for that lane. For example, if a lane is set for traffic moving north,
any traffic in that lane that may be moving south will be ignored. However, if the sen-
sor determines that most vehicles are going a direction different from the one that was
configured (e.g. during hurricane evacuation), the sensor will begin reporting vehicles
going all directions. Turning off Direction Protection allows SSMHD to always report
data from vehicles going both directions.
Note
If a lane has been configured to be bidirectional, Direction Protection will be disabled.