How can you confirm the operation of turn signals during an exterior inspection?

The correct approach to confirm the operation of turn signals during an exterior inspection involves activating the left and right signals and checking their functionality visually. This method ensures that the inspector can observe the signals directly to confirm they are functioning as intended, providing a clear indication that the lights are operational.

When you activate the signals, you can see not only if the lights illuminate but also if they blink at the correct rate and intensity. This direct observation is essential for safety, as functioning turn signals are critical for indicating a driver's intentions to other road users.

Other methods, though they may be useful in different contexts, do not provide the same level of certainty. For example, having a friend operate the signals might not guarantee the inspector can accurately see both sides of the vehicle, which may lead to missed issues. Checking only when stationary limits the ability to understand how the signals perform in a dynamic environment, which is not reflective of actual driving conditions. Additionally, using a diagnostic tool typically relies on electronic assessments and may not account for visible signs of failure, such as a bulb that appears burned out or a physical obstruction in the lens.

Thus, activating the signals and visually confirming their operation is the most effective and reliable method during an exterior inspection.