Traffic signal locations at intersections

when placing these down; what is the universally accepted placement and direction of signal lights?

Is it the location of pole/lights and direction of lights on the pole controlling traffic. Or is it attached to the Roadway stop line and pointed in the direction of signaling traffic?

Any help would be appreciated…
The Wiki info on usage is very generic in wording and solutions…

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Ce sujet de discussion accompagne la publication sur https://community.openstreetmap.org/t/traffic-signal-locations-at-intersections/104204