Rick Rivera, left, and Nathan Lichon spot the sneaky little cameras in an electronic billboard in Manhattan
In advertising these days, the brass ring goes to those who can measure everything — how many people see a particular advertisement, when they see it, who they are. All of that is easy on the Internet, and getting easier in television and print.
Billboards are a different story. For the most part, they are still a relic of old-world media, and the best guesses about viewership numbers come from foot traffic counts or highway reports, neither of which guarantees that the people passing by were really looking at the billboard, or that they were the ones sought out.