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It does. It uses a specific band on the electro magnetic spectrum commonly supported by most receivers

hm? Are you mixed up with Transit Signal Priority where Muni can request the light stay green a little longer?

I've never heard of the lights transmitting their timing

This article from SFMTA erroneously states that the busses use "GPS to communicate with the traffic signal", lol, what is the actual band used ?

I think the commenter was alluding to the 430 terahertz band.

SF traffic lights do not.

Of course they do. A specially trained human can even visualize those signals.

Lol I missed the joke.