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OCR for page 64
64 Abbreviations, Acronyms, and Initialisms HAWK High-intensity activated crosswalk NCUTCD National Committee on Uniform Traffic Con- HCM Highway Capacity Manual trol Devices HSD Honestly significant difference PDA Personal digital assistant HSRC Highway Safety Research Center RMSE Root mean square error ITE Institute of Transportation Engineers SAS Statistical Analysis Software LOS Level of service SUV Sport utility vehicle MOE Measure of effectiveness TTI Texas Transportation Institute MUTCD Manual on Uniform Traffic Control Devices on VCR Videocassette recorder Streets and Highways