Why is it important to observe the rear tires of the violator's vehicle during a stop?

Observing the rear tires of the violator's vehicle during a stop is crucial for safety reasons. When assessing the distance between your patrol vehicle and the violator's vehicle, a clear view of the rear tires helps determine how far the vehicle is positioned from the traffic lane and how close it is to your vehicle. This is important in ensuring that both you and the driver are at a safe distance from potential hazards, such as passing vehicles. Proper spacing can mitigate the risk of accidents during the stop.

In contrast, checking for expired registration typically pertains to the vehicle's documentation rather than the immediate safety of the stop. Ensuring tires are properly inflated is a maintenance concern that does not directly relate to the dynamics of the stop itself, nor does evaluating the driver's behavior. While all these factors can contribute to a comprehensive assessment during a stop, the primary focus during the stop should be on maintaining an appropriate and safe distance, making option B the most relevant.