Consider this <https://goo.gl/maps/dTJgnXm3tUG2> intersection. The traffic signal is for a one-way entrance ramp, so westbound traffic never stops, instead getting a continuous green. The only signal phasing is to stop the eastbound traffic to allow westbound left turns to proceed onto the ramp, and vice versa.
A routing application directing people onto westbound US 22/30 would see this as a full signal, rather than a continuous green. However, traffic_signals=continuous_green wouldn't work here, since the left turn signal is not a continuous green. It also wouldn't be right to draw separate ways here, since there's no barrier separation at all. What should simply work is to use traffic_signals:lanes=yes|continuous_green|continuous_green, however there is no documented usage of the key traffic_signals:lanes, so I wouldn't want to use it until I'm sure it'd be acceptable. For now I'll simply tag it as a plain old highway=traffic_signals. What does everyone think about the usage of traffic_signals:lanes? (It could also open the door for tagging the various sets of signals in an intersection, such as dedicated turning, permissive turning, etc, but the usefulness of this is debatable and is a subject for a full-blown proposal.) -- —Albert
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