quote: "Yep, I know that's a spy in the cab, but let's face it lorry drivers have had that for years and it has modified their behaviour so why not ours too?"
The problem with that type of justification is that it entirely depends upon the personal line people have drawn between acceptable and unacceptable monitoring. You are fine with there being monitoring in the vehicle, to reduce road crimes. I'm going to assume you would not be fine with 24h personal monitoring to report on any undesirable behaviour? The problem is that the justification for that kind of invasive monitoring is identical; if everyone is being monitored 24/7, then we can practically eliminate all crime (including driving offenses). You can also apply some FUD to that, stating that only paedos and terrorists (speeders and drink drivers) would dare to refuse such a well-meaning and beneficial policy. Law abiding citizens have nothing to fear :)
Of course in my personal experience, there is no such thing as a law abiding citizen on the UK roads. Every day, 80% or more of the vehicles I come into contact with (metaphorically, of course, I don't ram everything I see) are speeding. Average speeds on a motorway are 80+, and the 30 limit road to work has an average speed of 35+ (yes, it does indeed pass a school, and yes, nobody slows down for it unless they are turning in, or behind someone turning in). I've been driving more than 20 years, and in that time I have formed the opinion that anyone who tells me that they categorically do not speed, and they are a safe driver, is lying, whether they know it or not.
Evidence for this? Next time you see a marked police vehicle on the road do not adjust your driving in any way. Ask your significant other (or other regular passenger) if they have ever noticed you adjust your driving when confronted by a marked police vehicle. I guarantee you will instead automatically slow down and actually use your indicators properly, and that your SO will confirm this fact. The fact that every vehicle slows down when they spot a police vehicle shows that every driver (at least subconsciously) acknowledges they are probably going too fast.
Personally, I would recommend regular retesting (and make the test harder) over an automated accident call solution. The best way of minimising road deaths is to not have the accident in the first place, and this can be achieved by dramatically increasing the skill level required to be allowed to drive on the road. As an added bonus, fewer qualified drivers means less pollution, less fuel use, and more people using public transport, all of which the government keep telling us they want to happen anyway!
Also note: if you find yourself vehemently against the idea of increasing the difficulty of the driving test, and/or against taking it regularly, I would suggest that you are likely worried that you probably wouldn't pass it for some reason. What does that say about the level of your driving skill? Are you really a "safe" driver if you don't think you could pass an advanced driving test? ;)