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References <br />Chandler, B., Grey means go: Colorblindness in transportation. Institute of Transportation Engineers. March 2021. <br />Gates TJ, Carlson PJ, Hawkins HG. Field evaluations of warning and regulatory signs with enhanced conspicuity <br />properties. Transportation Research Record. 2004. <br />Kittitas County Public Works Department. Kittitas County Road Safety Plan. 2023 <br />24 <br />