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traffic control devices and distances shown in this booklet reflect desired wsdot.wa.gov/engineering-standards/all-manuals-and-standards/manualswebsite: dot.state.tx.us/TRF/mutcd.htm. 7. Whenever the acronym “TTC” is used in this guide, it refers to. “temporary traffic control.” The Washington State Patrol is available to assist WSDOT by enforcing excessive speed and drinking driver laws in critical work zone traffic control situations. authorized to represent him or her. Uniformed Police Officer (UPO) An officer commissioned to write traffic citations within the State of Washington Definition: Flagger. A person who provides temporary traffic control. MUTCD. The Federal Highway Administration's Manual on Uniform Traffic Control as currently Washington. MUTCD State Information Manual on Uniform Traffic Control Devices. State Traffic Control Detailed Drawings, Policies, Design Manuals, etc. The page provides information about ATSSA's Washington State FIT course. Washington State Flagger Certification Handbook. Washington State Standards &