The Outdoor Advertising Association of America reported spending rose 8 percent during 2005, making it one of the fastest growing sectors of media last year.
According to the OAAA, consumers are spending more time away from home where they are being exposed to increasingly more outdoor messages instead of in-home media.
Digital signage has likely had an impact on this growth.
Results were especially strong in some fast-growing categories:
-- communications +31.8 percent
-- insurance and real estate +16.4 percent
-- retail +11.7 percent