when are lights required to be installed on a trailer
All trailer lights must be permanently attached to the trailer. Lights on the side of the trailer must be parallel to the trailer's center line, while those on the front and back must be perpendicular to the center line, excluding lights that are installed at a photometrically certified angle.ear side lights must be red and placed as far back on the trailer as possible, between 15 and 60 inches high. Yellow front side lights must be placed as close to the front of the trailer as possible and be at least 15 inches high.