What is a common limitation of speed measurement devices?

• A. They cannot measure speeds over 50 mph
• B. They may be affected by environmental conditions
• C. They require constant battery changes
• D. They can only be used in urban areas

Answer: (B)

Speed measurement devices often face various limitations, one of which is their susceptibility to environmental conditions. Factors such as weather—rain, fog, or snow—can significantly impact the performance and accuracy of these devices. Additionally, interference from objects such as foliage or other vehicles can distort measurements. This understanding is crucial for law enforcement and other users because it can affect the reliability of speed readings taken under less than optimal conditions.

The other options do not accurately represent the limitations of speed measurement devices. For example, many devices can measure speeds well beyond 50 mph, they typically do not require constant battery changes assuming they are designed for efficient energy use, and they can often be used in both urban and rural settings depending on their type and purpose. Recognizing environmental impacts helps users better understand and interpret measurements, ensuring that speed enforcement is applied fairly and effectively.