Depending on their size, traffic signals constructed from polycarbonate, a composite plastic, weigh between 15 and 30 pounds. Traffic lights built from cast aluminium weigh between 30 and 50 pounds more.
Typically, traffic signals with an 8-inch lens diameter weigh 15 pounds, while those with a 12-inch lens diameter weigh roughly 30 pounds. The polycarbonate traffic signals often use plastic lenses and metal reflectors to reduce their weight. The smaller, lighter traffic signals with 8-inch lights are approximately 30 inches tall, but the larger ones stand approximately 42 inches tall.