Which court case established that an officer is justified in a speeding stop based on their estimate of observed speed?

The court case that established that an officer is justified in making a speeding stop based on their estimate of observed speed is State vs. Barnhill. In this case, the court ruled that an officer's visual observation and estimation of a vehicle's speed can provide reasonable suspicion to initiate a stop for speeding. This ruling is significant because it affirms that law enforcement officers are equipped to judge speed based on their training and experience, which can be crucial in enforcing traffic laws effectively.

This decision helps to clarify the legal standards regarding when an officer can take action based on their observations, reinforcing the idea that practical law enforcement experience is valuable and permissible in assessing potential violations of traffic laws. As a result, visual estimation, when reasonable, is an essential tool for officers in their effort to ensure road safety.