Which of the following describes a proper inspection of vehicle lights?

The correct answer emphasizes that lights on a vehicle are essential for visibility and safety, and therefore must be clean and of the proper color. Clean lights ensure that the brightness is at its peak and that the beam can be seen clearly from a distance, which is crucial for signaling to other drivers, especially during low-light conditions or inclement weather. Additionally, the color of the lights must conform to regulations—typically, headlights should be white, turn signals should be amber or yellow, and brake lights should be red. This standardization helps prevent confusion and allows drivers to easily understand the signals being communicated.

The other choices do not reflect safety standards or proper vehicle maintenance. Variation in color could lead to miscommunication on the road, while dirty lights would diminish visibility and effectiveness. Cracked or broken lights could completely impair the function of the lighting system, further compromising safety on the road. Therefore, maintaining clean and appropriately colored lights is vital for the proper functioning of a vehicle.