Here in the elbow of CA, the speed limit signs are the minimum speed in bad weather.
As far as who follows the law where, it's interesting to compare Rome and Paris... the drivers in Rome are a trope but it's all true. The French definitely seem to have a lot more respect for the law as a community effort. My wife took a Velib the wrong way up the sidewalk in Paris, you would not believe the dirty looks she got; but in Rome the few share bikes were all apparently stolen and their stations were parked full of 50cc scooters.
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Genesis 49:16-17