I know it's legal for speed and distance signs to be im metric in the US. I think i read on this site a few months ago that in 1993 congress passed a law to allow metric signs. Why would congress have to pass a law when the metric system has been legal since 1866? I wonder if in the next 50 years we'll see metric signs on US roads. By that time i will be long gone and won't care.         

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