What are the dot regulations for trailer lights?

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State and federal regulations regarding trailer lights, which is overseen by the Department of Transportation (DOT), address the placement, function, and visibility of trailer lights for passenger car and light truck towing.

Safety Chains

Safety chains must be crossed and attached to the tow-bar or trailer hitch assembly. They must cross as near as possible to the tow-bar or trailer hitch.

Tail Lamps

There must be at least two tail lamps on the rear of the trailer, mounted at a height of between 15 and 72 inches on the same level, widely spaced. These two lamps must consist of at least one red light visible up to 1,000 feet and a white license plate light visible up to 50 feet.

Stop Lamps

There must be two red lights of a red, amber, or shade in between mounted on the rear of the trailer, visible up to 300 feet in sunlight. These can be part of another lamp assembly.

Signal Lamps

Signal lamps of a red, amber, or shade in between must be mounted on the rear of the trailer, spaced as widely as possible, and visible in direct sunlight from a distance of 500 feet on a trailer 80 inches wide, or 300 feet on a trailer less than 80 inches wide.

Minimum Lighting

Any trailer not required to have lighting, such as those for agricultural uses, must have a minimum of one red light in the rear, visible up to 1,000 feet, and two red reflectors visible at all distances from 100 to 600 feet.

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Safety chains

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What are the dot regulations for trailer lights?

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