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> Because it's a "zero tolerance" after "10 mph tolerance" policy.

And....

The US has a zero tolerance alcohol policy over 0.08 after a 0.08 tolerance policy.

If that's your entire point its not a very compelling one.

And is that policy billed as a "zero tolerance for drinking and driving policy" or a "zero tolerance for drunk driving" policy?

There is a law against drunk driving that mentions a 0.08 threshold. There is a law against speeding that doesn't mention 10mph leeway.