What Are the Dimensions of a Traffic Light?


Quick Answer

There are two traffic signal sizes, differentiated by their approximate lens diameter, 8 inch or 12 inch. The 8-inch traffic signals are approximately 30 inches tall, 9.5 inches wide and 6 inches deep. The 12-inch signals are 42 inches tall, 13.5 inches wide and 8 inches deep. These measurements apply to the main body of the signal without visors.

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What Are the Dimensions of a Traffic Light?
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Full Answer

Incandescent and halogen bulbs in signals are increasingly being replaced with LED arrays that consume less power. In the United States, the 8-inch lights are slowly being phased out in favor of the larger and more visible 12-inch lights. There is a hybrid design that is standard in some Canadian jurisdictions, and it features one or more 12-inch lights on the same signal with one or more 8-inch lights. In the United Kingdom, 8-inch lights are the standard thanks to highly visible specialty lenses, which make a larger surface area unnecessary.

Traffic signals are generally made out of two kinds of material: cast aluminum and polycarbonate. Aluminum signals weigh about 30 pounds for the 8-inch model and 50 pounds for the 12-inch model. Polycarbonate signals are much lighter, particularly the ones using plastic lenses and aluminum reflectors. They typically weigh 15 pounds for the 8-inch signals and 30 pounds for the 12-inch signals.

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