Is it permissible to use RADAR within 300 feet of warning signs?

Using RADAR within 300 feet of warning signs is not permissible because it can lead to inaccurate speed readings due to the proximity to situations where drivers may react to the warning signs. These signs often indicate upcoming conditions that require drivers to slow down, thus affecting their speed in a way that does not reflect their typical driving behavior. The regulation aims to ensure that speed enforcement is conducted in a manner that is fair and realistic, allowing for the collection of reliable data on vehicle speed.

When RADAR is deployed too close to a warning sign, the results might not justly represent habitual driver speed for that stretch; this could undermine the legality of any subsequent citations issued based on those readings. Therefore, maintaining a minimum distance helps to uphold the integrity of enforcement actions and ensures that speed measurements are not influenced by these immediate warning conditions.