What might indicate that vehicle lights are not functioning correctly?

Selecting the presence of cracks or dirt on vehicle lights as an indicator of malfunction is justified because these imperfections can significantly affect the functionality and visibility of the lights. Cracks can lead to water and debris entering the light assembly, which may cause electrical issues or reduced light output. Dirt or grime can obstruct the light beam, making it difficult for the lights to illuminate the road effectively, which poses a safety hazard.

Maintaining clear and intact lights is essential for proper vehicle visibility and for signaling intentions to other road users. Thus, noticing cracks or dirt should prompt a thorough inspection and possibly a cleaning or replacement of the light fixtures to ensure they are functioning as intended.