How large are those traffic signals (the ones that hang above the road on those power lines) and how much do they weigh? (They look to be around 3 feet high.)
Are they manufactured by just one company or do many companies make them?
Do they use special light bulbs?
They run 3 - 4 feet in length, and about 13 inches across. The weight varies depending on the number of lights in the enclosure. Typical weights for the polycarbonate signals are 14 - 29 lbs. The more modern lights use an array of LEDs. They are manufactured by at least 7 companies that I have found with just a cursory search. Hope that helps! 