I can see several issues here, but these are the ones which immediately spring to mind:
1. If there is more than one route from an entry camera to an exit camera, how do the SPECS work out which route was taken? If they can't, they have no way of determining the average speed.
2. How will the local residents react to people driving along in second gear, which is the only realistic way to be sure that your average speed stays at 20 or below? Or that's what most people will assume they have to do. I would have thought that the threshold would be 10% + 2 (i.e. 24), but - even if this is the case - how many people actually know that? And how much will this increase the pollution?
3. How much less efficient is driving at 20 in second gear than at 30 in fourth? I thought that we were trying to conserve our dwindling fuel stocks.
4. They come out with the usual stuff about how 19/20 pedestrians survive when hit at 20, but 19/20 die when hit at 40. In what way is this relevant? How did they arrive at these figures - by getting pedestrians to leap out straight into the path of cars driving at these speeds?
That'll do for now. As usual, a nice idea in theory, but one which clearly hasn't been thought through - if it has even been thought about at all.
