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Meet Nicky and Dominic - they patrol the motorways in what looks like a police car. When they receive a call from Sarah, it's time to hit the road...
The Highway's Agency says it is not taking on crime fighting aspects of police work. But just like any other citizen, they can report dangerous driving. And it's no accident that this sign looks authoritative.
Once we're travelling, I notice that no one is overtaking us. Dominic says this is what the police call "compliance" - and because we're in what seems to be a police car, drivers are afraid to pass and break the speed limit.