What is the primary legal requirement for conducting speed enforcement using radar?

The primary legal requirement for conducting speed enforcement using radar is that the operator must have proper training and certification. This ensures that the individual conducting the speed enforcement is knowledgeable about the operation of the radar equipment, understands how to accurately measure and interpret speeds, and is aware of the legal implications of their actions. Proper training includes understanding the technical aspects of radar technology as well as the applicable laws and regulations governing speed enforcement. This certification process is intended to maintain the integrity of speed enforcement and ensure that the evidence collected is valid in a legal context.

The other options, while they may relate to conducting speed enforcement, do not carry the same weight as the requirement for proper training and certification. While visual observation can be an important part of the process, it alone does not ensure accurate enforcement or protection of legal standards. The requirement that a speed camera must be stationary at all times might apply to certain types of enforcement but does not universally affect all radar operations. Additionally, the visibility of the police vehicle may be a best practice for transparency and deterrence, but it is not a strict legal requirement for the enforcement process using radar.