Re: Wait a minute...
If every vehicle has these things then pedestrians can safely walk out in front of any vehicle and not get run over.
And the problem is that pedestrians will do that, and the car driver won't get anywhere at all. Result - driving a car in town becomes a very slow way to travel.
This already happens. Look at city centers on a Friday/Saturday night. People, esp after a few drinks, think "They won't run me over, I'll just cross and ignore the traffic".
I can see this becoming annoying, but I don't think it's a strong argument against autonomous vehicles. I'd rather have the ability to engage the self-driver and sit back than have the stress of watching out for these ****s myself, not to mention all the idiot drivers.
Bottom line is, IMHO, that self-driving cars are coming, and they will save a lot of lives. They will be more convenient in most situations. With the ability to just hail one (probably for a darned sight less than the total cost of owning a car) will leave most with little reason to buy their own. It's the future and, while it won't be here next year, I foresee them being everywhere a decade or so from now.