I saw this in action in the Whelen/ Havis demo vehicle at Priority One's Light Up The Night Vehicle Show...very awesome!
http://customers.havis.com/index.php/product-news/integrated-control-system
http://www.youtube.com/watch?v=WJQzUM-SXwk
http://customers.havis.com/index.php/product-news/integrated-control-system
http://www.youtube.com/watch?v=WJQzUM-SXwk
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