What type of light must be present for a trailer weighing over 3,000 pounds?

For a trailer weighing over 3,000 pounds, it is required to have a license plate light. This is important because the license plate must be visible at night and under various conditions, making it necessary for both identification and regulatory compliance. The license plate light serves to illuminate the rear license plate, ensuring that it can be read by law enforcement as well as other drivers, which is crucial for registration and safety purposes.

While the other types of lights mentioned play important roles in vehicle visibility and signaling, they do not fulfill the specific requirement for illuminating the license plate. Emergency flashers are intended for signaling a vehicle in distress, fog lights assist with visibility in foggy conditions, and turn signal lights indicate the driver’s intention to change direction. However, none of these directly address the need for proper lighting of the license plate, which is mandated by safety regulations for larger trailers.