Traffic signals made out of polycarbonate material, which is a composite plastic, weigh between 15 and 30 pounds depending on their size. Traffic signals made out of cast aluminum weigh a bit more, ranging from 30 to 50 pounds.
Traffic signals whose lights have a lens diameter of 8 inches typically weigh 15 pounds, while those with a 12-inch lens diameter are usually around 30 pounds. The polycarbonate traffic signals tend to use lightweight plastic lenses and reflectors of aluminum, which reduces their weight. The smaller, lighter traffic signals with 8-inch lights are about 30 inches tall, while the larger ones are about 42 inches tall.