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Keep in mind that how strict the speed limits are seems to vary significantly by local laws and driving culture.

https://en.wikipedia.org/wiki/Speed_limits_in_the_United_Sta...

So what might be unacceptable "speedo pedo"ism where you live might be completely normal going 5 miles over the posted speed limit elsewhere. My personal experience is that people tend to drive at a speed they feel safe at, and don't pay that much attention to the signs.

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Japanese law requires the police to prove that you were speeding beyond reasonable doubt, so posted speed limits are all 20km/h+ under the de facto speed limit. It leads to absurd situation like expressways with a posted 60km speed limit but a 100km/h real limit.

That's the reason we need to enforce speed limit. People are terrible at assessing what's safe. Even if they can somehow manage to assess their personal safety they have terrible judgement when it comes to other road users. You may feel very safe going over speed limit in a residential area but pedestrians, cyclists etc. won't.

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