What factors can affect the accuracy of speed measurement devices?

• A. Road conditions only
• B. Only the speed of the vehicle
• C. Environmental conditions, device malfunction, and improper operation
• D. Weather conditions primarily

Answer: (C)

The accuracy of speed measurement devices can be influenced by a variety of factors, making the selected choice the most comprehensive and correct. Factors such as environmental conditions—like temperature, humidity, and visibility—can impact how signals are transmitted and received by speed measurement devices. Additionally, if the device malfunctions due to improper maintenance or calibration, this can lead to incorrect readings. Lastly, improper operation by personnel, including incorrect setup or usage, can also compromise the accuracy of speed readings.

In contrast, focusing solely on road conditions or only the speed of the vehicle ignores other critical influences that can lead to measurement inaccuracies. Similarly, while weather conditions are important, limiting the factors to just weather does not encompass the broader range of potential issues that can arise with speed measurement devices. Therefore, the broad spectrum of possible factors highlighted in the correct answer provides a more accurate understanding of what can affect the reliability of these devices.