Publications

This project evaluates a broad range of factors influencing microtransit adoption and travel behavior among underserved populations using original revealed choice survey data collected from February – May 2024 with online and intercept surveys.

This dissertation examines clean energy supply chains in the context of the just transition and circular economy frameworks, focusing on a central technology for zero-emissions transportation: lithium-ion batteries (LIBs) for electric vehicles (EVs). The author focuses on three phases of the LIB life cycle: mineral extraction, component and cell manufacturing, and end-of-life management.

A team at the University of California, Davis, conducted a case study in Sacramento, California, to explore bikesharing as an option for connecting affordable housing residents with transit services. This brief summarizes the findings from that research and provides implications for the field.

Using the 2017 National Household Travel Survey, this study quantifies and compares travel burdens in rural versus nonrural communities in the United States.

In this paper, the authors present a new sensor location model that aims to maximize observability of link densities in a dynamic traffic network described using a piecewise linear system of ordinary differential equations.

This dissertation consists of six studies that explore the environmental sustainability and social equity implications of micromobility services, separately and together. The studies compiled in this dissertation examine the implications of travel behavior for environmental sustainability through the lens of equity.

Traffic sensors serve as one of the most important sources for such data by providing an accurate and reliable general picture of the traffic system. In this dissertation, a new sensor location model is developed to maximize the observability of link densities in a dynamic traffic network described using a piecewise linear ordinary differential equation system.

This study delves into the energy and emissions impacts of Shared Autonomous and Electric Vehicles (SAEVs) on disadvantaged communities in California.

In this study, a modeling framework was developed to generate high-resolution synthetic fleets, for use with synthetic household modeling in activity-based travel models, by integrating various data sources.

The 2023-24 survey collected data from 4,774 people affiliated with UC Davis about their travel to campus.

In this work, a literature review of key parameters that can facilitate desired CO2 uptake for transportation projects at their end of life is conducted and an initial meta-analyses of data from the literature to inform CO2 uptake for individual projects is performed.

To address the challenges of electric grid stress and fleet operator costs associated with commercial electric vehicle fleets, this report presents a highly flexible smart charging algorithm for managing EV fleets that arrive and depart from a common depot on a schedule.

This study applies bootstrap analysis to historic transportation project item cost data to develop improved estimates of item cost-confidence bounds for use in transportation project cost uncertainty analysis (a component of lifecycle analysis).

This report discusses an EV adoption model that employs synthetic population at the census tract level to show the effect of vehicle body type on EV spatial distribution and home-charging access in California.

To add insights into air travelers’ ground transportation choices, this study collected a dataset with a survey administered among travelers using four major airports in Northern California in the post-pandemic era.

This study highlights the potential of a coordinated routing system to enhance urban traffic efficiency by dynamically adjusting incentives based on drivers’ choice data and driver behavior.

Researchers examined what makes a feebate policy work and how this strategy can be leveraged to shift US vehicle markets. This research included a review and analysis of feebate mechanisms in European countries.

This paper reviews and assesses feebate design types, issues, and implementation strategies in France, Germany, Italy, Sweden, and the United Kingdom. Effective feebate design can help accelerate the zero-emission vehicle transition commensurate with international climate goals.

This paper assesses the potential utility of feebates for shaping the US light-duty vehicle market. The analysis shows revenue-neutral incentive systems for encouraging zero-emission vehicles are possible and can be effective.

This study examined the sustainability of shared micromobility services using data from 48 cities in the US using a 21-day smartphone travel diary and survey data.