During a pre-trip inspection, what should you ensure regarding trailer lights?

Ensuring that all lights function properly and are visible is essential for safe trailer operation. Trailer lights are key to communicating your intentions to other drivers on the road, especially in terms of braking, turning, and visibility during nighttime or inclement weather. A fully functioning lighting system includes tail lights, brake lights, turn signals, and clearance lights, which help prevent accidents by making your vehicle more visible.

Properly functioning lights also adhere to legal safety standards. If any lights are malfunctioning or burnt out, it could lead to citations or penalties during inspections. Additionally, issues such as burned-out bulbs may not only be illegal but could also create dangerous situations on the road due to reduced visibility or failure to signal intentions.

Maintaining visibility and function of trailer lights is crucial for enhancing safety and complying with road regulations, which is why this choice is the correct answer.