What main principle was addressed regarding the use of RADAR technologies?

The primary principle addressed regarding the use of RADAR technologies is the visibility of vehicles from a distance. RADAR technologies are designed to detect and measure the speed of vehicles over a considerable range. This capability allows operators to monitor traffic in conditions where visibility might be limited due to factors like weather or distance. Understanding how RADAR functions in relation to vehicle detection is crucial for effective speed enforcement and ensuring that operators can accurately gauge speeds without needing to be in close proximity to the vehicles being monitored. This principle underscores the importance of RADAR as a reliable tool for speed detection in various driving conditions.

The other principles, such as safety protocols for operators, accuracy of measurement technologies, and equipment maintenance, while important in their own rights, are not the central focus when discussing the fundamental capabilities of RADAR technology in traffic enforcement.