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Special traffic signals can be used as landmarks for navigation. For example, it may be easier to find a junction if you know there's a blinker there.
- traffic_signals=blinker: a 'mini' traffic signal, mounted in the normal place above the intersection, that flashes yellow if you have right-of-way and red if you must stop.
- traffic_signals=blink_mode: a normal traffic signal that can be activated, but is normally set to blink. It may be changed to normal operation in the future when an intersecting road is completed, or may be used only for special events.
- traffic_signals=emergency: a normal-looking traffic signal, often in front of a fire station, that turns red only to give emergency vehicles right-of-way. Color details may be different (e.g. flashing yellow instead of solid green in the bottom lens). Often a sign mounted next to the signals states 'emergency signal'.
- traffic_signals=ramp_meter: a signal on an onramp to a motorway that limits traffic to promote free-flowing traffic. May be activated only during rush hours.
- traffic_signals=controller: not widely used. May overlap with the proposed man_made=street_cabinet + street_cabinet=traffic_control, or with the approved and widely used man_made=monitoring_station + man_made=monitoring:traffic
Possible rendering: remove one of the three lenses from the normal traffic signal symbol.