In London, congestion pricing information is going to be used for spying. From the BBC (link) via The EcoLibertarian (link):

Anti-terror officers will be exempted from parts of the Data Protection Act to allow them to see the date, time and location of vehicles in real time.

They previously had to apply for access on a case-by-case basis.

I like congestion pricing, but as with all government programs, there is plenty of room for abuse. What’s wrong with having judicial review?