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In 2015, the Portland City Council unanimously passed a resolution committing Portland to Vision Zero, the goal to eliminate traffic deaths and serious injuries. An underpinning of Vision Zero is that streets are managed for safe speeds. This presentation will summarize Portland's speed management process, how it relates to achieving Vision Zero, and present two case studies in which speed limits were reduced: (1) a 25 mi/h to 20 mi/h reduction on residential streets and (2) various reductions on arterials and collectors. Reduction sites in which additional treatments were implemented, such as speed humps and fixed speed safety cameras, will also be discussed. Results of the data analysis will be shared, along with next steps in Portland's speed management process.

Biographical Information

Dr. Jason C. Anderson is a research associate and adjunct instructor at Portland State University. Dr. Anderson’s expertise is in data analytics, particularly advanced statistical and econometric methods, with an emphasis on transportation safety, transportation economics, travel behavior, and policy (impacts of policy changes on safety). His work on policy-related contexts has led Oregon to develop and maintain a Safety Action Plan aimed at reducing truck driver-at-fault crashes on state highways. He was also part of a team that updated Oregon’s safety investigation tools. He has been PI and Co-PI on projects related to each of these areas. Although much of Dr. Anderson’s work has been focused on freight transportation, he has worked on several projects that focus on various modes. His work on pedestrian safety has led to countermeasure evaluation and selection in the state of Oregon. Dr. Anderson’s research on transportation safety has helped advance fundamental knowledge on various factors that influence the risk and severity of freight transportation-related crashes and the effects of speed limit changes on driving behavior and safety. Recently, Dr. Anderson has begun fusing these statistical and econometric methods with machine learning approaches to study transportation safety and travel behavior.

Clay Veka (she/her) is the Vision Zero Coordinator at the Portland Bureau of Transportation (PBOT). She has worked in traffic safety for 15 years, including joining PBOT’s Vision Zero team when it launched in 2015. Clay has her master’s degree in Urban Design and Planning from the University of Washington.


Transportation | Urban Studies | Urban Studies and Planning

Speed Management and Speed Reduction in Portland, OR