Randomly stalling 20 % of autonomous cars is enough… to stall cities.

Hackers Could Use Connected Cars to Gridlock Whole Cities | Research Horizons | Georgia Tech’s Research News … :

“Randomly stalling 20 percent of cars during rush hour would mean total traffic freeze. At 20 percent, the city has been broken up into small islands, where you may be able to inch around a few blocks, but no one would be able to move across town,” said David Yanni, a graduate research assistant in Yunker’s lab.“