Dubious. A human driver is also not going to take off with a cone on their hood. So fine, you need a human to take it off, what do you expect? The next problem after that is that the technician needs to reset the car's system... because it tries really hard to fail safe when something unexpected happens? And this is meant to be proof that they're dangerous?
Weird, unexpected things happen on the road every day. Are we seriously going to potentially risk gridlocking a city (not to mention our personal safety) for the gains of a small handful of private corporation as they test this black-box tech out against us?
