From Texas Public Radio:
Your morning commute is guided by invisible forces in the form of sensors, electronic traffic signs and lights. As complex traffic systems become more and more integrated, the potential for traffic-fueled calamity increases, say cyber security experts.
In May of 2016, drivers in Dallas woke up to a strange sight: Someone had hacked a number of roadside Texas Department of Transportation signs and put in its own message about then-candidate Donald trump.
“Donald Trump is a shape shifting lizard!!” read the sign. Dallas drivers were unscathed by the stunt that made the rounds on social media.