Which of the following is NOT a requirement for truck lights?

In Texas, truck lights have specific requirements to ensure safety and compliance with traffic regulations. The stipulation that they must be decorative is not a requirement. Instead, truck lights are functional components designed to illuminate the road and make the vehicle visible to others, enhancing overall safety.

Requirements such as operational status, color specifications (like amber for certain lights), and installation height are crucial to maintaining visibility and adherence to state laws. Each of these aspects contributes to the effective performance of lighting on a vehicle, ensuring that trucks are seen in various driving conditions. Therefore, while operational status, color, and height are essential for the safe operation of truck lights, the decorative aspect is not mandated and does not serve a practical purpose within the context of vehicle safety and inspection standards in Texas.