Exploration of Weather Impacts on Freeway Traffic Operations and Safety Using High-Resolution Weather Data

i Acknowledgments ii List of Tables v List of Figures vi 1.0 INTRODUCTION1 2.0 LITERATURE REVIEW 4 2.1 Backgrounds 4 2.2 Relative Risk Ratio Method 6 2.3 Gaps in Current Research8 3.0 DATA SOURCES10 3.1 Study Location10 3.2 Weather Data Sources 11 3.2.1 PORTAL Data ArchiveWeather Satiation Data 11 3.2.2 Next Generation Weather Radar Doppler (NEXRAD) Data 14 3.2.3 PORTAL VS. NEXRAD Weather Data19 3.3 Crash Data 22 4.0 METHODOLOGY 25 4.1 Relative Risk Ratio25 5.0 RESULTS28 6.0 CONCLUSIONS 33 7.0 REFERENCES 35