"Martin Evans" wrote in message
...

Unless you only keep to back roads in the middle of nowhere, when you
loose the GPS signal and pass a big brother monitoring point your
vehicle will be identified either by the number plates or by something
like RFID. Maybe you will be able to pass one or two monitoring
points with the GPS out of service and get away with it but do it
regularly you have got to expect a visit from Mr Big to probe your
black box.

Even without a GPS signal the car will still record how many miles you've
done so they'll just charge you at peak rate.

I would also expect petrol pumps will have to be modified to interogate your
box as well and only serve petrol if it's working properly.


GPS signals are also by design remarkably immune to "a few watts of
spurious emissions on the right frequency"

Yeah - takes a nuclear warhead to block them properly ;-)
But there's a far better use for that ............