I also wonder how much revenue will be lost for the police without speeding tickets being handed out?

This is a commonly made mistake that I hear all the time. In fact, speeding tickets are NO REVENUE for the police. The only one who benefits is the government. This is not the same thing. The officer who writes the ticket or makes the report won't see one cent more revenue on his paycheck because he wrote that ticket or report (and so it should be!)
Also the police force in general won't benefit at all from it.

So I see little chance of this "big brother" system ever getting implemented. Not only because of the technical issue, but mostly because this system would mean a serious drain of revenue for the government. I can guarantee you that the government nowadays depends on those speeding tickets and looks at it as some sort of sure income.

In reply to:

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in replie to Roger :
Besides, it's not speed that kills, it's driving too damn close to the car in front, or driving too fast for the conditions.

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Amen to that. I've seen A LOT of accidents in the last couple of years because of my job. Mostly only with material damage, but some unfortunately were fatal to the ones involved. I've literally seen people ripped apart because of accidents. Has this changed the speed at which I'm driving? No.
It has however changed the way that I'm driving. You'll NEVER catch me tailing another car, OR speeding when the conditions are not right for it. But I don't have any problem with driving home at 2AM on the interstate in dry weather at 160 km/h when I'm literally the only car on the road.
So those would also be my nr. 1 driving tips if I ever was to give some : keep your distance and adjust your style of driving to the conditions that are on the road !

On the cell phone in the car issue : Using a hands free kit is probably equally distracting as phoning from the car without one. (or smoking in the car, or eating, etc...) Heck, they never outlowed mobilophones (the pre-GSM type) or CB's !
[sarcasm mode]
The only difference is that now everybody has a mobile phone, and so it's become increasingly profitable for the government to make the handsfree sets obligatory. Because more people using mobile phones equals more people "needing" handsfree sets equals more handsfree sets sold equals more revenue because of VAT. And in case some stubborn driver refuses to buy such a handsfree set, he can get fined, so that equals also more revenue because of the fines. (mmmm....I'm starting to see a pattern here!)
And to top it all off : we can sell this to the general public in the spirit of our new "safer traffic policy"! Incredible, a win-win-win situation.
[/sarcasm mode]