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$70 per sign AASHTO According to FHWA agency goal agency had postponed Alabama Alabama’s estimate American Trucking Association ballpark Battelle construction contracts advertised conversion cost conversion education effort conversion to metric converting highway signs cost of converting data-driven estimate develop national cost difﬁcult driving public effort to convert English units federal agency Federal Highway Administration Federal Register notice federal-aid funds FHWA has tasked FHWA ofﬁcials told FHWA’s August 31 FHWA’s estimate FHWA’s Metric Conversion FHWA’s option highway sign conversion inefﬁciencies kilometer posts Metric Conversion Act metric conversion plan metric education metric signs metric system metric units milepost markers million signs national cost estimates number and types number of signs Ofﬁce overlays percent supported option prohibited received on FHWA’s reference system Replace highway signs road signs Secretary of Transportation September 30 signage signiﬁcant signs are converted signs to metric speed limit Target date Trafﬁc Control Trucking Association ofﬁcial