Traffic Light or Railway Signal
" ... "a triangular object with lights. One green, one red, and the other two amber." We're going out on a limb here and identifying this one as a traffic light."
Most Road Traffic Lights don't have two Amber lights.
Depending on the location, I would go out on a different limb, and say it was a railway signal. A number of Colour Light signals from the 1960's era are arranged with a Green above Yellow above Red with an offset Yellow next to the Red.
Only problem with both hypotheses is that neither a traffic light nor a railway signal would ever have all lamps lit at the same time.