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This study investigates the effect of rainfall on transit performance measures at the route level in the Puget Sound region of Washington State. Transit agencies are required to report certain performance metrics to the Federal Transit Administration (FTA), but performance measures can also be used to evaluate service and provide customers with information regarding the transit system. Using a three-year sample of archived automatic vehicle location (AVL) and hydrologic data the relationships between ridership, travel time, delay, and rainfall were investigated. The analysis of daily ridership and rainfall resulted in no statistically significant results, however, the results are supported by the existing research in this field. There was a generally negative trend in ridership with respect to rainfall. The analysis of travel time and rainfall did not result in the expected outcome. It was hypothesized that travel time would vary with rainfall, but that was not always the case. During many rainfall events the travel time remained average. The analysis of delay and rainfall shows that the impact of rainfall on delay is more complex than assumed. The delay during dry trips was different than the delay during light and moderate rain, but during heavy rain the statistical different disappeared. These results, implications for transit operators, and future research opportunities are discussed. v ACKNOWLEDGMENTS I want to express my deepest gratitude to my chair, Dr. Robert Bertini. Since he came to the university he has opened his door to provide not only technical assistance but career and life guidance. His belief in his students is unparalleled, and his help throughout the study process has allowed me to achieve more than I thought possible. Dr. Anurag Pande throughout my graduate studies has challenged me to push beyond what is expected and this has improved my technical engineering skills. Thank you to Dr. Cornelius Nuworsoo for his seemingly endless availability to provide any assistance necessary. He has allowed me to excel as a leader, and these skills will be invaluable as I begin my career. and the rest of the students in the Master of City and Regional Planning program who not only tolerated my antics, but shared their knowledge, opinions, and helpful comments during these past few years. I would like to acknowledge Ruth Kinchen from King County Metro for supplying the archived bus data for this study. Thank you to Dr. Ryan Avery for this connection. Finally, none of this …

USING ARCHIVED TRANSIT DATA TO ANALYZE THE EFFECT OF RAINFALL ON TRANSIT PERFORMANCE MEASURES AT THE ROUTE LEVEL