Hacked roadside billboards are in the news again, so it felt like a good time to take a look back on some of the more notable incidents that have caught the medias attention in the past. In 2009, a Texas road sign warned drivers of zombies in Austin, Texas, you have to watch out for ‘ZOMBIES AHEAD’ Welsh hackers meddled with a billboard on Cardiff’s main shopping street, to display swastikas, far-right images, and Big Brother.”]
Source: https://grahamcluley.com/a-short-history-of-hacked-billboards-and-road-signs/