Proposed features/Emergency Traffic Signals
|Emergency Traffic Signals|
|Definition:||For permanently placed traffic signals that are only in operation for emergencies along highways.|
|Rendered as:||Same as normal traffic signals on Mapnik; colorless traffic signal on osmarender|
We need an official tag to separate normal traffic signals from ones that are only used in emergencies and remain inactive (flashing yellow; stays green; or completely off) when not needed. Here's a link to an example of one style of emergency signals here is the US for fire stations: example This would also be useful for tunnels on highways that have emergency traffic lights before their entrance in case of a major problem happening inside that they need to stop traffic for. You can see an example from the Ft. Pitt Tunnel here in Pittsburgh on this Youtube video.
If people tag them as normal traffic signals, they will be hit with the time penalty that routing software has for them when it isn't necessary. That's where the extra tag comes in to define exactly what type of traffic signal it is. Hopefully the routing software people will also accept this proposal and eliminate any time penalties when a traffic signal node has this extra tag.
Most fire stations have emergency traffic signals on the roads in-front if they would have problems getting out onto a busy road. Also, several highways have them before you enter a tunnel in case they need to close the tunnel completely because of an accident. They are also present at draw bridges, but those could be as a separate proposal with a different tag.
|Used on node|
|emergency=*||Reason why the signal is placed (examples: Fire Station; EMS; tunnel; lift bridge) [will not effect rendering] (optional, but recommended)|
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