Size of traffic signals

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! :smiley: