Some heavy-duty trucks like the Ford Super Duty, Chevrolet Silverado HD, GMC Sierra HD, and Ram 2500 and 3500 commonly wear small amber and red lamps on their roof. If you ever wonder about why it’s because of a federal rule that makes this illumination mandatory on vehicles over 80 inches wide. These pickups’ broader rear fenders generally make them apply to this regulation. The folks from GM Authority discovered an odd exception to this though.

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