Charles C. Ebbetts - Construction workers eat their lunches atop a steel beam 800 feet above ground, at the building site of the RCA Building in Rockefeller Center in New York, Sept. Plus the unpublished version of the iconic photograph.
lamppost of the future, in its twilight - Forgotten New York
Telephone pole version of standard mast lamppost. In the NYC version, the mast is flanged for some reason, and bolted onto the pole through a triangle or diamond shaped metal plate. And many of them would have severe rusting problems. (Also bears GE "scoop" figure).
Now, NYC is adopting a one-piece davit pole, which [variations of] could be found in places like Philly, Albany, and certain Long Island highways and Maryland hwy rest stops. There is also a double version (a bunch of them going in at Williamsburg Bridge Plaza this month), which are still single piece, rather than two masts bolted to a pole.
Flatbush-Nostrand Junction, generic pole (with ROUND post, even), and different, double masted traffic light mast (which is much more common in New Jersey, and in fact it's familiar standard pretty much. Another identical setup was in Times Square (the only lampposts with that kind of mast to sport traffic lights, until recent decades).
Standard lamppost shape, which can be found many places (like Washington, DC), but NYC's are unique in using octagonal poles. When I was a kid, they NEVER had the full "guy wire" traffic light masts mounted; it was only the "quarter-loops" that used those, but now many do, possibly from quarter loop masts being replaced with the standard mast.