Construction signs hacked

Someone, or a group of someone’s in or around the University of Toronto has figured out how to hack the construction signs and is using them for environmental messages. Not only the ones shown here proclaiming “Don’t Driveâ€Â? and “Take Your SUV Back to Detroitâ€Â? but also advertising a campus event on sustainability.
A few comments in the original post complained that such nefarious activity could be considered terrorism. Any thoughts?
