[toast0]

I hope that self-driving cars will broadcast their intentions, so other cars can use that to get a better prediction of where the car will be. But the broadcast processing definitely needs to be done carefully: the data may be corrupted or malicious, so the receiver needs to carefully process it to avoid crashing (software or vehicle), and also check it against the picture of reality it gets from its sensors.

If the vehicle in front of you tells you it will accelerate, you shouldn't accelerate too, unless you can verify the acceleration and that it's safe for you to do so.