As I felt with their first video, these "security researchers" play with the steering on a car moving 40mph on a public road. Now they've gone and done this. Playing with the driving controls on a 2 ton vehicle moving at 70 mph on a busy road.
In this video they said "it wouldn't be anything life threatening" which shows that they don't have a clear view of reality in the situation. A seat belt won't
you have a 70mph head on collision with a semi. The driver wasn't informed beforehand that he could bail out of the test by restarting the car, they waiting
until he was panicing to try to tell him that.
What if they made a mistake and turned the car into oncoming traffic? What if their computers were remotely controlled?
Is the situation with car's vulnerabilities serious? Yes of course.
Will this video help to drive home the problem to the public? Maybe, but probably not.
Should they have done this demo on a public road? Absolutely not.
Bottom line, when you are doing a test where there is physical risk, you need to be in control of the environment and not putting the public in harms way.
This isn't your home computer and your email account. This is real life.