How many rear clearance lamps are required on each side of a trailer with a gross weight over 3,000 pounds?

For a trailer with a gross weight over 3,000 pounds, the requirement is to have two rear clearance lamps on each side. This regulation is in place to enhance visibility and safety by ensuring that other drivers can clearly see the outline of the trailer, especially in low light conditions or during inclement weather. The two lamps on each side help provide adequate illumination and are positioned to effectively mark the trailer's width.

This requirement is specifically aimed at larger trailers, as they can present more challenges in visibility and maneuverability compared to smaller vehicles. Having a sufficient number of clearance lamps helps to mitigate these challenges, making it easier for other road users to gauge the trailer's dimensions and its position on the road.