ECN Forum Forums Photo Discussion Forums Electrical Nostalgia Old Traffic Signal

You learn something new everyday. I've always been told that it meant green's Hot, as signals are rarely grounded in the field (by a grounding wire at least.) That's why I make the harnesses/cables for my lights, while a lot of people use 14/3 w/ ground SO cord.

Thanks Scott.

Ian A.

Which is generally the red. For a given intersection, there may be a green light that is on more than the red for that direction, but overall, the reds get the most use. There is always at least one direction that has a red light, which is not true of the green or amber.

New York City started by changing the reds first. The greens followed soon after.

I believe the yellows are still incandescent bulbs.

In Victoria, Green is ground and LED Reds can be changed every 2 years LED Greens and LED Yellows after 5 years. Every traffic signal must be visited every 2 years for LED instead of every year for incandescent. Even though the reds typically have a Mean failure rate 10 times longer than incandescent lamps the reds are still required to be changed around every 2 years. It seems that reds must have the highest reliability and the few years we have been using them they are proving to be very reliable and of cours the decreased loads aer good for the city budget too. Longer service intervals is not good for the city electricians but otherwise the taxpayers are happier.