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The impact of angle on radar speed measurement is significant, as it can directly influence the accuracy of the speed readings obtained. When radar waves are transmitted at an improper angle relative to the target vehicle, it can cause a phenomenon known as "cosine error." This error occurs because the radar measures the component of the speed of the vehicle that is directly toward or away from the radar unit. If the vehicle is approaching from an angle rather than directly towards or away, the speed reported will be lower than the actual speed.

For instance, if the radar is not aimed straight at the target and is instead at an oblique angle, the speed calculation may yield a value that does not accurately reflect the true speed of the vehicle. Therefore, ensuring that the radar is positioned at an optimal angle—ideally perpendicular to the path of the target vehicle—is crucial for obtaining precise speed measurements. This principle applies to both stationary and moving radar units.

In contrast, stating that the angle has no impact on accuracy or that it is irrelevant would overlook the fundamental principles of radar operation and physics. Similarly, the assertion that angle only affects Lidar measurements is incorrect, as angle considerations are valid for both radar and Lidar technology. Thus, understanding the impact of angle is essential