Why is it important for officers to remain out of sight of a violator during pacing?

Remaining out of sight of a violator during pacing is crucial for ensuring a valid speed measurement is taken. When an officer is visible to the driver being paced, it can lead to changes in the driver's behavior, particularly causing them to adjust their speed in reaction to the officer. This reaction can skew the speed measurement, leading to inaccurate readings that do not reflect the driver's true speed prior to being observed. By staying out of sight, officers can more accurately assess the speed of the violator without interference, thus providing a reliable basis for any subsequent enforcement action. This practice upholds the integrity of the speed measurement process and supports effective law enforcement efforts.