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100   $a20210630d2019      ua             0
101 0 $aeng
135   $aur|||||||||||
181   $ctxt$2rdacontent
182   $cc$2rdamedia
183   $acr$2rdacarrier
200 00$aEfficient messaging for changeable-message signs during nonrecurring events
210  1$a[McLean, Va.] :$cUnited States Department of Transportation, Federal Highway Administration,$d[2019]
215   $a1 online resource (2 unnumbered pages) $ccolor illustrations
300   $a"FHWA-HRT-19-012."
300   $a"HRDS-30/01-19(WEB)E."
606   $aVariable message signs$zUnited States
606   $aElectronic traffic controls
615  0$aVariable message signs
615  0$aElectronic traffic controls.
712 02$aUnited States.$bFederal Highway Administration,
801  0$bGPO
801  1$bGPO
906   $aBOOK
912   $a9910716531503321
996   $aEfficient messaging for changeable-message signs during nonrecurring events$93297404
997   $aUNINA