Whatis the case lawthatsays "Where several cars traveling inmass over the posted speed, their speed is legal"?

Case Law states "Where several vehicles traveling, in mass, have exceeded the posted speed limit, those vehicles are, for the sake of safety, proceeding at the legal limit". Simply stated, you are driving in and with the traffic flow over the posted limit. As all are doing the same speed, regardless of... show more Case Law states "Where several vehicles traveling, in mass, have exceeded the posted speed limit, those vehicles are, for the sake of safety, proceeding at the legal limit". Simply stated, you are driving in and with the traffic flow over the posted limit. As all are doing the same speed, regardless of the posted limit, you are all to be considered driving at the legal limit. What is the case from which this case law derives?
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