Could a computer virus take down every car on the road?

Imagine you're riding in an autonomous or semi-autonomous vehicle. Suddenly, your car seems to take on a mind of its own, turning off in the middle of a busy intersection. Now imagining that happening at every intersection in the country. In a world of vehicles that are connected to the Internet, what's stopping a computer virus from taking down our entire transportation network? Could a hacker take down every car on the road?

The Globe and Mail