How, and how often, is a fixed speed detection system calibrated and checked for accuracy?
Detection system accuracy is established at the time of installation by comparing the speed indicated by the system with a calibrated detection device. The system is configured to an accuracy of +/- 1 MPH of the calibrated detection device reading. The term “calibration” is often used inappropriately in this situation. There are no adjustments made once the initial setup is accomplished, and the only way to change the way the system detects vehicle speed is by changing one of the two constants involved (#1 the distance between the two sensors, and/or #2 the way time is measured by the computer).
