What is one of the requirements for the condition of lights?

For the condition of lights on a commercial vehicle, the requirement that they must be undamaged and clean is critical for safe operation. Damaged lights can impair visibility and may lead to hazardous situations on the road, while clean lights ensure that their brightness and clarity are not compromised by dirt, grime, or debris. Proper visibility is essential not only for the driver’s awareness but also for communicating with other road users through signals. Clean and undamaged lights contribute to overall vehicle safety, compliance with regulations, and proper functioning during night driving or adverse weather conditions.

The other options do not address the crucial aspects of functionality and safety as effectively. While having bright and flashy lights might seem appealing, the focus in a pre-trip inspection is on operational integrity and visibility. Modern design or compatibility with LED technology, while beneficial, are not fundamental criteria for assessing the practical safety and effectiveness of vehicle lights.