What is one of the functions of the turn signals that should be checked?

The correct choice emphasizes the importance of turn signals being functional and clear, which is essential for safe driving. Turn signals are crucial for communicating a driver’s intentions to other road users, making them a vital safety feature on any commercial vehicle. They need to be visible and in good working condition to ensure that other drivers can see when a vehicle is turning or changing lanes. If the turn signals are not clear or malfunctioning, it can lead to confusion and potential accidents on the road.

Visibility and functionality are the key factors here; a clear signal ensures that the indication of a turn or lane change is easily understood. In contrast, having damaged or colored signals, or signals that are missing when they are needed, would compromise safety. Proper inspection of turn signals is part of the pre-trip inspection process, ensuring you comply with safety regulations and best practices while on the road.