How to Download Traffic Signal Data from OSM
Openstreetmap offers a handy API for querying their database: XAPI. You’ll find the docs on their wiki at http://wiki.openstreetmap.org/wiki/Xapi.
To download all traffic signals within a certain bounding box:
http://xapi.openstreetmap.org/api/0.6/node[highway=traffic_signals][bbox=16.26,48.18,16.31,48.20]
Free and Open Source GIS Ramblings 
Thanks for sharing, and works well – one just needs to query an active server. I used this one http://jxapi.openstreetmap.org/xapi/api/0.6/