Which of the following is NOT a reason to fail turn signals?

Turn signals are an essential component of vehicle safety, as they communicate the driver's intentions to other road users. The reason that a signal being "working properly" is not a reason to fail a turn signal is straightforward: functional turn signals are crucial for safe driving.

When a turn signal is operational and effectively indicates the driver's intent to turn or change lanes, it fulfills its primary purpose, contributing to overall road safety. This means that if the turn signal functions correctly, it should not be a cause for failure during an inspection.

In contrast, conditions like being damaged, having moisture inside the housing, or being inoperable directly impact the functionality and reliability of the turn signal, which are valid reasons for failure. These issues can prevent the signal from working or being seen clearly, potentially leading to dangerous situations on the road.