> So the nodes where the signals_area intersects the highways is where the
signals would normally be mapped for complex intersections?

Not exactly. It would be difficult to do so if you have really complex
junctions with really many individual traffic signals and you want to catch
all of them – a zickzack that is not easy to draw and not practical to
maintain. The area is drawn just _around_ everything that is considered the

About the individual traffic signals. We recommand as current best-practice
to not map them if you use the area. Means: Don’t do both things. (But
maybe in the future this could be considered useful and it could be done
without breaking the tagging scheme just like every other normal traffic
signal with highway=traffic_signals on a node.)
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