Road Updates (Score 1)

As I've been reading through this I've run into a major problem with the system. How do you deal with updates to the road network and changed speed limits? As I see it there are two ways, either you update every car every year (costing tens of millions of pounds each year), or you have the car inform the satelite where you are, when, how fast you are going, and in which direction. Now that sounds like information the british government would LOVE to get their hands on. SOVINFORMSPUTNIK, here we come!