"from non-U.S. editors"
A variant that comes to mind is a traffic signal that is a bit like the emergency variant, or a railway crossing signal: normally off, but whenever a bus approaches from the (a not-necessarily-bus-only) side street, it first blinks yellow (here, that's "may proceed with extra caution") for some seconds, and then changes to red to facilitate a speedy passage for the bus; once the bus has passed the detector after the signals, the lights turn back to flashing yellow, and soon off. (There's also a timeout in case the outbound bus isn't detected properly.) At rush hour, the signals can activate on average every few minutes, or every ten minutes late in the evening, or even more rarely. Some of these are for trams, some for buses. Alv 17:11, 22 November 2012 (UTC)
- I've since used traffic_signals=bus_priority and traffic_signals=tram_priority for these. Alv (talk) 05:19, 6 May 2013 (UTC)
- I'm not sure there's a proper way to tag this situation other than the standard highway=traffic_signals tag. Such information can easily go out of date as there need not even be a specific time of day where the signals change modes. --Skquinn (talk) 21:50, 18 February 2018 (UTC)
- For fire stations, traffic_signals=emergency seems to be the most obvious choice. We have these in the US too where the lights are normally flashing yellow but change to solid yellow and then red when an emergency vehicle is leaving. --Skquinn (talk) 21:51, 18 February 2018 (UTC)
What is traffic_signal=signal (or signals)
Today (8 April 2018), close to 96% of the values used with traffic_signal=* are signal or signals. What does that mean ?
I believe both of these values do not give any additional information to crossing=traffic_signal, but it becomes the most used value because these key + values are used by default in OSM iD online editor when adding a pedestrian crossing or traffic signals. Any other idea ?
- I agree, it looks like tag pollution to me. Does anyone know why iD adds this, and what purpose it is supposed to serve? --Skquinn (talk) 10:45, 8 April 2018 (UTC)
- It seems that the wiki page traffic_signals=* doesn't describe the "classic" traffic signal with 3 lights (e.g red, orange, green). Maybe the traffic_signal=signal/signals describes this traffic signal with 3 lights. The meaning of this value should be clarified, and then documented in the wiki, since it is de facto a standard value for traffic_signals=* --Kazing (talk) 10:17, 10 April 2018 (UTC)