From OpenStreetMap Wiki
|Used on these elements|
|Tools for this tag|
traffic_signals:sound=* is used with crossing=toucan/pelican/pegasus to indicate that sound is emitted when crossing is permitted.
- Use traffic_signals:sound=yes when there are both signals.
- Use traffic_signals:sound=no when there are no acoustic signals.
- Use for partial sound signals:
A renderer is Look and Listen Map.