Analysis of socioeconomic and built environment factors influencing travel mode choice of older adults in Georgia

This paper explores the travel behavior of older adults in comparison to younger adults using the 2017 U.S. National Household Travel Survey Georgia Add-on. We employ a discrete mode choice model to examine how the relationships between travel outcomes and socioeconomic, trip, and built environment characteristics vary by age. Travel modes are categorized into automobile, public transit, and non-motorized modes (i.e., walking and biking). The analysis reveals significant differences in factors related to non-auto mode travel outcomes between age groups. The presence of health conditions is associated with a lower likelihood of older adults choosing non-auto modes, and this effect intensifies with age. The association between trip purposes and travel outcome also varies; home-based-other purpose trips, such as healthcare appointments or community activities, are associated with a higher probability of older adults choosing non-motorized modes compared to other trip purposes. Residential density is more of a factor for older adults' non-auto mode choices, and older adults living in non-auto mode supportive environments are more likely to maintain non-auto mode usage. The study further finds that older adults and those with health conditions live and travel in less dense, less walkable areas than their counterparts, which makes it difficult for them to have viable non-auto transportation options. To expand mobility options for older adults, planners should design programs for older adults with health conditions and provide services for those who can no longer drive or without access to automobiles. Additionally, considering built environment conditions and the varying needs of individuals based on trip purposes is recommended to satisfy the mobility needs of older adults in accordance with their lifestyles.