Wouldn't speeding/red light cameras come closest? Certainly "swift and certain" if the locations are posted. Modest? Well, in many locations you can get a fine based on these cameras, but often no points/impact on insurance rates.I wish we could have 'swift, certain and modest' penalties for all traffic violations. I think people would follow the rules more than they do now.
They certainly change behavior when people know the cameras are present, but the devices aren't very popular with the public.
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