How To Perform Automatic Speed Calibration - Image Sensing Systems RTMS G4 User Manual

Chapter 3

How to Perform Automatic Speed Calibration

Automatic Speed Calibration is intended for use with higher-volume traffic, flowing at stable
speeds.
1. Start the WinRTMS software.
2. Select Speed Calibration from the listed options.
3. Use the Up/Down arrow keys to highlight the per-lane Reference Speeds.
The Left/Right arrow keys will decrease or increase the reference in 2 MPH / Km/h
increments, which may be estimated or measured (For example: using a radar gun).
4. Click the Time Indicator and increase or decrease the calibration time with the Right and
Left arrow keys. A minimum of 2 minutes is required, although 3 to 5 minutes is best,
depending on traffic volume. The internal speed coefficients will not update if traffic is too
light.
5. Click the Start button and wait as the lane speeds change from their current level towards
the Reference Speeds.
6. You can click the Pause button to avoid contaminating the process if traffic slows down
momentarily or there is a large gap in the traffic flow. You can then Resume. This is
particularly handy when calibrating mid-block applications. You can also change the
Reference Speed during calibration, only if more than 2 minutes are remaining. If after
sufficient time the difference to the reference speed is still more than 10%, manual
adjustment may be necessary.
7. Click on Manual if necessary.
8. Click Exit when you are finished.
G4 User Manual © 2009 ISS Canada
G4 Software
3-29