01214nam 2200349 450 991071653150332120210630151258.0(CKB)5470000002522843(OCoLC)1258128079(EXLCZ)99547000000252284320210630d2019 ua 0engur|||||||||||txtrdacontentcrdamediacrrdacarrierEfficient messaging for changeable-message signs during nonrecurring events[McLean, Va.] :United States Department of Transportation, Federal Highway Administration,[2019]1 online resource (2 unnumbered pages) color illustrations"FHWA-HRT-19-012.""HRDS-30/01-19(WEB)E."Variable message signsUnited StatesElectronic traffic controlsVariable message signsElectronic traffic controls.United States.Federal Highway Administration,GPOGPOBOOK9910716531503321Efficient messaging for changeable-message signs during nonrecurring events3297404UNINA