Impact of transit and biking infrastructure on sustainable mobility use in the Puget Sound region

Abstract: With increasing urbanization and environmental concerns, promoting sustainable transportation has become a pressing need for cities worldwide. The present study explores how improvements in transit and biking infrastructure impact the adoption of sustainable transportation modes, such as public transit and cycling, in the Puget Sound region. Using data from the Puget Sound Regional Council (PSRC) 2019 Transportation Survey, the study proposes a Structural Equation Modeling (SEM) approach to examine the relationships between infrastructure improvements and travel choices. The study addresses two key questions: (1) How do enhancements in transit and biking infrastructure influence the use of sustainable transportation modes? (2) What demographic, socioeconomic, and attitudinal characteristics are associated with individuals who opt for sustainable transportation options?

Understanding the factors influencing transportation choices offers insights into how travel behaviors might be shifted toward more sustainable alternatives. The anticipated contributions of this research include providing evidence on the effectiveness of infrastructure investments in promoting sustainable transportation, identifying key demographic groups for targeted interventions, and offering policy recommendations for enhancing transportation sustainability. The findings will be particularly relevant for urban planners, policymakers, and transportation agencies aiming to design equitable and sustainable transportation systems that meet the needs of diverse populations while addressing broader environmental and social goals.