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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]

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