Influence of Street Trees on Frequency of Vehicle Collisions in Seattle

Abstract

This thesis explores the correlation between street trees and motor vehicle crash frequency in Seattle, WA, focusing on the implications for livability and safety. While previous literature initially suggests a potential negative relationship between trees and crashes, the present study finds no significant correlation in the case study area of Seattle. Additionally, the study highlights the complexity of the relationship between trees and crash frequency at the census block level. It is likely that factors like tree placement, density, and proximity to roadways play a significant role in influencing this relationship. Therefore, it recommended that to better understand this observation, other factors such as driver behavior, road design, and traffic patterns must also be considered, as they may overshadow the influence of street trees. A comprehensive analysis incorporating these variables is necessary for more definitive conclusions.