What must be avoided to ensure headlights are not obscured during inspection?

To ensure headlights are not obscured during inspection, it is essential to avoid anything that reduces the light emitted by the lamp. Headlights must provide adequate illumination for safe driving, and any obstruction or diminishment of their brightness can significantly affect visibility. This is crucial when considering vehicle safety, as reduced light output can lead to unsafe conditions at night or in poorly lit environments.

In the context of the inspection process, a vehicle's headlights should be checked for clarity and functionality. If there is dirt, grime, or any material that reduces the light output, it can prevent drivers from seeing the road effectively or from being seen by other drivers. Thus, ensuring that headlight functionality is unimpaired is a vital part of the inspection process.