The Register gleefully dismisses the utility of automobile tracking data being bought by the UK government but cautions:
a copper or a spook is investigating you and he notices that your car has SmartNav, he can - probably without a warrant from a judge or a politician - get full details of your movements from the DfT, who get them automatically from TrafficMaster.... the location slugs are identifiable by unique vehicle number, so all the watchers need is one known time and location ... [conventional methods are more expensive and better regulated]
TrafficMaster sounds a lot like the US "OnStar" service, so people tempted to buy it should remember how the same kind of service has been abused in the US for police eavesdropping which also disabled the safety features, for speeding convictions and even in car spam. These things are always worse than people fear because honest people are never able to imagine all of the potential abuses. TrafficMaster customers might also think twice about their cell phones if they value privacy.
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