The accuracy of speed detection can be affected by which of the following factors?

The angle of measurement and distance is a critical factor in the accuracy of speed detection because radar and lidar speed detection technologies rely on precise calibration to obtain correct speed readings. When a speed detection device is not aligned perpendicularly to the path of the oncoming vehicle, the reflected signal may not provide an accurate speed. For instance, if the measurement is taken at a sharp angle, the calculated speed can be distorted due to geometric factors, leading to an underestimation or overestimation of the vehicle's actual speed. Additionally, the distance between the device and the vehicle affects the signal strength and clarity, which can further impact measurement accuracy. Therefore, ensuring the device is positioned correctly regarding angle and distance is paramount for reliable speed measurement.