Philadelphia Daily News, August 21, 2007
By CATHERINE LUCEY
Digital billboards – which rotate through several static advertisements each minute – will make their debut in the Philadelphia area this week. Already the high-tech signs have critics.
Clear Channel Outdoor Holdings has installed four of the computer-controlled billboards in the city and four in the surrounding counties. Advocates say the boards benefit advertisers, allowing them to easily change their messages – touting a sale one day and a new product the next.