What does the term "lay opinion" refer to in the context of speed measurement?

The term "lay opinion" in the context of speed measurement refers to general observations made by trained officers. This type of opinion is based on the direct observations and experiences of officers rather than on technical or scientific analysis. Trained officers, through their experience, can form opinions about a vehicle's speed based on visual cues, helmet-mounted radar displays, or pace clocks, enabling them to reliably assert whether a vehicle is speeding without needing to rely on complex formulas or elaborate scientific methods.

This term emphasizes the role of firsthand observation in law enforcement, highlighting the importance of practical experience and training in accurately assessing situations related to speed enforcement. The distinction lies in the fact that lay opinions, while grounded in training, do not carry the same weight as expert opinions that would require specialized knowledge or formal education in fields such as engineering or physics. This captures the essence of how officers utilize their learned skills to assess and report on speed-related violations effectively.