NOTE: The original document was published by the US Department of Transportation's Federal Highway Administration (FHWA) as Part VI of the Manual on Uniform Traffic Control Devices (MUTCD): "Standards and Guides for Traffic Controls for Street and Highway Construction, Maintenance, Utility, and Incident Management Operations," 1988 edition, Revision 3, September 3, 1993. The current edition of the MUTCD is available online.
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