Well, better that he was tailgating those cars in front of you than tailgating you!
When you think about it, this forgiveness thing is stupid.
Very stupid. They should use accurate equipment and enforce it strictly. If the limit is too low for some conditions it should be raised. It's a limit, a maximum; it's not a minimum, a requirement, or a suggestion. There are plenty of laws lowering the limit from the posted number to address conditions.
As it stands, at least in my area of the US (and I think it's similar in most of North America), 99% of drivers are breaking laws 99% of the time, therefore they are at the will and mercy of law enforcement who have the power to pull over any driver at any time, look in the windows for excuses to tear apart the car, etc. Not only that, but it also creates racial tension and difficulty for officers who are just trying to do their job normally; in order to avoid accusations of racial profiling, officers probably have to pay attention to race and use it as part of the decision whether or not to act. If limits were reasonable and traffic laws strictly enforced then there could be no racial profiling (neither the kind that is complained about, nor the kind that the complaints may create). There are other types of profiling not addressed by law or culture, such as young drivers, modified cars, beat-up cars, etc; these unfair treatments, rarely discussed but also offensive in my opinion, would also be impossible. Possibly even more importantly, aggressive drivers wouldn't have any excuse to feel righteous about their behavior when they push around somebody for obeying the law.
It'll never change because that would take power away from law enforcement, but it's a nice fantasy.
1980 Buick LeSabre 4.1L 5MT
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Humans have rear-biased AWD. Cows have 4WD