What should a driver check when inspecting a truck's lights?

When inspecting a truck's lights, ensuring that all lights function correctly and are clear of obstructions is essential for safe operation. This involves checking not only that each light turns on and off properly but also verifying that the lenses are clean and free from any physical blockages, such as dirt, snow, or other debris that can diminish visibility. Properly functioning lights are critical for communication with other drivers, particularly in low visibility or night-time conditions. Any malfunction or obstruction can lead to dangerous situations, as lights are vital for signaling turns, stops, and maintaining visibility on the road.

Options focusing on aesthetic appeal, color verification, or simply counting the number of lights do not address the essential functionality and safety aspects of the truck's lighting system, which is the primary concern during an inspection.