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http://signalfan.freeservers.com/history.html
http://signalsofnewyorkcity.weebly.com/history-of-signals-in-new-york-city.html
http://www.policeny.com/ptlmofpatrol2.html
http://www.dot.state.fl.us/publicinformationoffice/historicdotphotos/roads/orlstrt.shtm
http://www.marktraffic.com/traffic-lights-invented-by-william-l-potts.php
http://www.kbrhorse.net/signals/history01.html
http://www.shorpy.com/node/204
http://foto-history.livejournal.com/2696636.html
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