Red lights got you down?  No problem, a laptop, radio card, some experimenting, and you can change red lights to green before you arrive at an intersection.

“attacks show that an adversary can control traffic infrastructure to cause disruption, degrade safety, or gain an unfair advantage”

Research by the University of Michigan presented at the 8th USENIX Workshop on Offensive Technologies, Green Lights Forever: Analyzing the Security of Traffic Infrastructure.