wilscott1 wrote:
Clearly if you get ?ve from someone else you can just return the favour, but it could be made so that a ?ve given counts for ½ a ?ve received to encourage people to avoid confrontation.
Not entirely with you there. How can I give someone a neg but they only receive half a neg? And how does it help? If I have -40 we'll all know that I've really had 80 people neg my driving. That's not supposed to tell you anything about my driving btw.

wilscott1 wrote:
Technically, I guess it requires transponders and an automated system which offers vehicle description and location for feedback.
I think a lot of people would want concrete reassurance that the system could not be used for other purposes. Personally I wouldn't trust the current government with it. Or the last one come to think of it. Or the one before that.
wilscott1 wrote:
I think it would be a way to encourage people to think of the impact of their road behaviour on others.
Just blueskying ? whaddaya think?
Well, it might promote a bit more courtesy on the road, and we could certainly do with that. I don't know if it would make things a lot safer though. One thing that I woder about is tha actual operation. Presumably a driver having just been let out and who feels like giving a pos to the other driver is going to have to do something in the car to achieve that. In busy traffic how would the system know to send it to the right car? Does the sender have to put in a registration number? Rather they spent their time driving properly than trying to read someone's plate and type it in to a box on the dash. Worse still when someone's just been carved up and the adrenalin is making them go "right, you *******, neg coming your way".
How about a slight change in the idea?
Let's say all cars have a few small digital cameras put on, phone cam size ones. They'd be constantly recording and dumping the video so that they always have the last 30 seconds or so in the memory. If someone cuts you up or tailgates or whatever, rather hitting the horn and preparing a mouthful of abuse you hit a different button and the last 30 seconds from all the cameras is saved. When you get home you can take out the card, transfer the video and e-mail it to the local plod for that area. There'll be a good chance that they'll have a registration on there and depending on what was actually done can send out the appropriate sort of letter - or ignore it entirely if the first driver had over reacted.
What makes it interesting is that if someone is driving particularly courteously you could do the same thing. If the plod get this insurance database they could pass on any video of "nice" drivers to the appropriate insurance company, who could then do something about rewarding such behaviour. I was thinking about a discount to start with, but ha-ha-ha some hope

. Perhaps Clubcard style points that drivers could use for a variety of things. Even a pat on the back letter would be something.
Like your original idea it still depends on a driver making some input, but no more so than is currently needed to wave a thank-you or hit the horn. It also won't cause any civil liberties worries about transponders because there won't be any. People will have an incentive to drive courteously and a disincentive to drive agressively, providing that the driving culture takes it on board and is willing to go through the process to acknowledge good driving. Without that we revert back to all stick and no carrot.
One big drawback that will probably prevent it ever happening, and so I'll point it out before anyone else does. As a society we're becoming increasingly concerned about being filmed and we're especially suspicious of any filming of children, even when it's entirely incidental. I remember seeing a letter in a photography magazine where some guy thought he was going to get a kicking from a concerned dad who thought the bloke was taking pictures of his kids. The guy had to show the angry dad the scene through the viewfinder so he could see that the kids only appeared as specks in the distance. I suspect the same sort of worries would apply to cameras on cars being misused, even when their potential misuse really ain't that big.