You're not going to like this.
In London, the inner city has a congestion charge applied to road traffic - if you enter the zone, cameras record your vehicle and if you haven't pre-paid, oh dear.  They know you're there.  We have a similar thing near my home on a toll road through a new tunnel.  I saw a review of a sports car with in-built GPS that recognizes when it's on a racetrack (some racetracks have track days for the public) and switches itself into race mode by electronically changing suspension settings, fuel injection etc.  Now I'm going to string some technology together...  In Europe, large passenger coaches have speed limiters - no matter what the driver does, the coach won't go faster than its maximum legal speed.  I told you you weren't going to like this.  So...  Say every vehicle had a speed limiter that recognised where the vehicle was...  Your speed would be limited to the legal maximum wherever you were.  No more speeding tickets.  Ever.  Emergency vehicles would be exempt of course, but then their drivers are properly trained aren't they?  Seriously, why mess about with speed cameras and radar traps - just eradicate speeding altogether, the technology's already there.  No more high speed car chases through urban areas.  Less road deaths.  Even here in NZ, seven people were killed on the roads just the other weekend.  Police said excessive speed was a factor.  They needn't have died then.  What do you think?