What must be checked for the truck’s headlights during the inspection?

The correct answer emphasizes that the truck's headlights should not be cracked or broken during the inspection. This is a crucial safety measure because functional and undamaged headlights are essential for visibility while driving, especially at night or in poor weather conditions. Cracked or broken headlights can not only reduce light output, impairing the driver’s ability to see the road clearly, but they may also pose a risk by allowing moisture to enter, potentially damaging the internal components and affecting performance.

Ensuring that headlights are in good condition is critical for both the safety of the driver and others on the road. In contrast, a yellow tint is not a requirement for headlights; they typically should be clear. The assertion that only the high beam should work is incorrect, as both high and low beams must be operational for versatility in different driving conditions. While adjustability of headlights may be beneficial in helping to aim the light correctly, it is not a primary focus during the routine pre-trip inspection compared to ensuring no cracks or breaks are present.