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It varies from jurisdiction to jurisdiction. US has laws about presumptive speed and absolute speed.Not stirring but genuinely interested: what are the speed rules when driving on US freeways? I have driven extensively in the US but have never quite grasped what the etiquette is on the freeways, it seems the speed limit is voluntary with the majority of the traffic travelling well above the limit. The presence of police does not cause the traffic to slow down, is there just a general tolerance for moderate speeding or is there a specific amount you can legally go over? The ADAS would very very frustrating in these circumstances.
Presumptive safe speed may be higher than the posted speed, eg if the posted speed is 55 but flow of traffic is 60, then it can be argued that the safe speed is actually 60. Some jurisdictions in the US (I believe Florida is one of them) will give out tickets for not driving at a safe speed even if that means going over the posted speed limits.
Some things have absolute speed limits. In California you can't speed in a school zone for instance or at a railroad crossing, those laws are absolute.
And that kind of summarize it. The speed you can drive kind of depends on where you are, what environment you drive in and what the laws for that jurisdiction states. I think it's generally appropriate to follow the flow of traffic and avoid excessive speed. I suggest that if everyone is going faster then going 8-10% over the speed limit then it's generally safe to go along unless you're in an area full of children or other vulnerable road users, limited sight lines, rail road crossing etc (drive the speed limit in those locations)..
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