How do we tackle the problem with mutliple driverless vehicles? They need to communicate in some way. But how should they do that? Will there be a secure way of communication that would be safe enough to use so cars could not be taken over remotely?,(reply>), Why would they have to communicate?  Human drivers rarely communicate.,(reply>), @seigeengine<br>No more (or less) so than human drives tapping the brake pedal to turn on the brake light and confuse other human drivers. Or, for that matter, throwing physical debris on roadways or any number of other ways to force cars to drive more cautiously. If you can deal with the attack safely, and you can record it, it'll be easy enough to localize if it's frequent enough to be a problem.,(reply>), @seigeengine The benefit is that the recipient can act in a way that's safe for false information and more safe for true information. If the lead car signals that it's braking sharply, the following car can slow down sooner based on that signal than by measuring. If the signal is false, it just has some unnecessary room. If it's true, it has a better chance to avoid an accident. In the situation with lots of spurious car signals, the car would just drive more slowly and stay further from detected real cars, under the assumption that something weird is going on and unexpected real events are more likely, so extra room to maneuver might be important.,(reply>), I see what you are saying. I'm guessing the developers of the systems are thinking that having both systems is better than just one. Building in some redundancy?,(reply>), @seigeengine<br>I don't understand your last comment. The systems that I have read about that are being developed by universities work by a simple system that each car broadcasts basic info over a short range. Any listening cars in range parse that info into a position in relation to itself. The idea being that if a driver suddenly veers out of their lane, the offending car reports the change of direction faster than you can react. Your car is made aware and can apply the brakes avoiding a collision.<br><br>If you are suggesting that someone would drive along with a car set to broadcast fake speed / direction data. The car's other proximity systems would throw up the inconsistency and ignore the fake broadcast as corrupted data.<br><br>Each car listens out for a burst of data containing an ID, a location, direction, velocity and status of indicator lights or activation of brakes. Even if you wanted to hack the system by broadcasting dozens of fake car signals from non existent cars. Your own car would figure that the spurious cars didn't exist. I don't know how else you could influence my car with yours.