New Publication: Bike sharing differences among Millennials, Gen Xers, and Baby Boomers: Lessons learnt from New York City’s bike share

Authors: Kailai Wang, Gulsah Akar & Yu-Jen Chen

Abstract: There is a growing literature on the changing travel patterns in the United States. The changes are largely driven by the emerging shared-mobility services and the travel behavior of the younger generations. This study builds on an investigation of Millennials’, Gen Xers’ and Baby Boomers’ bike sharing ridership in New York City. This study examines station-level bike share use focusing on whether and how the effects of land-use and built environment vary across different population segments. Using New York’s Citi Bike system data, we develop zero-inflated negative binominal models to estimate hourly trip productions at stations for five age cohorts: younger Millennials (born 1995 to 2000), mid Millennials (1989 to 1994), older Millennials (born 1979 to 1988), Generation Xers (born 1965 to 1978), and Baby Boomers (born 1946 to 1964). Consistent with the literature, our results suggest that weather related variables, land-use and built environment characteristics have significant effects on the overall bike sharing usage. Our findings also reveal variations across age cohorts. For example, intersection density is positively related to younger Millennials’ bike share trip production. However, this factor is not statistically significant for other age groups. Our findings provide valuable insights for planners and policy-makers, and set the basis for improving the understanding of cohort differences in bike sharing demand.

Publisher’s link 

Check out our new publication: Driverless vehicles’ potential influence on bicyclist facility preferences

Abstract: Research in the field of autonomous vehicle technology focuses on its enhanced safety and convenience for vehicle occupants. The present paper seeks to establish a line of inquiry that addresses the implications of autonomous vehicle technology for nonmotorized road users, in the present case, bicyclists. Studies show that motorized traffic volume and speed affect nonmotorized agents’ behavior and facility preference, but the degree to which this will apply to a driverless environment requires further study.

Bicycle facility preferences

We developed a stated-preference survey that had respondents select their preferred facility in a variety of hypothetical scenarios with and without the presence of driverless vehicles and on street types of varying motorized traffic volumes and speeds. A Random Parameters Logit Model is estimated to analyze the links between facility preferences, sociodemographics, street types, and the existence of driverless vehicles. The model results suggest that increases in motorized traffic volumes and speeds correlate with a greater preference for separated facilities. The presence of driverless vehicles amplifies this preference. Controlling for other factors, under driverless vehicle conditions, the odds of selecting protected facilities, such as buffered bicycle lanes and cycle tracks, were more than double the odds found under current conditions. We conclude with recommendations for infrastructure and policy and suggestions for future research in this nascent field of study. Publisher’s link.

Yujin receives WTS Columbus Chapter Award


Yujin Park and Louie Husseini, WTS Columbus Scholarship Director

Yujin receives WTS (Women’s Transportation Seminar) Columbus Chapter’s Helene M. Overly Memorial Scholarship. The scholarship was established in 1981 by WTS International to encourage and support women pursuing graduate studies in transportation or a related field. She received her award on February 8th, 2018 during WTS’s Annual Awards Event! Congratulations Yujin!




Our group at TRB 2018!

Left to right: Kailai Wang, Mi Young Park, Yujin Park, Gulsah Akar and Na Chen

Our group presented three papers at TRB in January 2018!

Y. Park, N. Chen and G. Akar “Who Is Interested in Carpooling and Why? The Importance of Individual Characteristics, Role Preferences, and Carpool Markets”, 97th Annual Meeting of the Transportation Research Board (TRB), January-2018, Washington, D.C

K. Wang and G. Akar “Street Intersection Characteristics and Their Impacts on Perceived Bicycling Safety”, 97th Annual Meeting of the Transportation Research Board (TRB), January-2018, Washington, D.C

K. Wang, YJ Chen and G. Akar “Joint Analysis of the Impacts of Built Environment and Bikeshare Station Capacity on Trip Attractions Across Different Gender and Age Groups” 97th Annual Meeting of the Transportation Research Board (TRB), January-2018, Washington, D.C