Publications

This study contributes to our growing understanding of environmental justice rising from vehicle electrification, underscoring the need for policy frameworks that create a more equitable transportation system.

This study models the active transportation and vehicular travel traveling modes in a multi-modal network problem taking into account TNC services, such as, e-hailing, e-pooling, and express pool. The objective is to analyze passengers' choices among active transportation, solo driving, and TNC services, considering various trade-offs related to health, monetary, time, and inconvenience costs, and their subsequent impacts on traffic network performance.

This dissertation introduces new novel data-driven coordination techniques through intelligent controlled charging applied to drayage trucks operations and indirect controlled charging by proposing innovative pricing strategies for LD, MD, and HD EVs.

In this dissertation, advanced eco-trajectory planning algorithms have been developed to address four challenges.

This paper compares factors impacting mode shares in 2012 and in 2017 to answer part of the question about why we see this decrease in the use of active modes over this period and what types of planning, programs, and policy actions may help to reverse this trend and get California back on track to increase walking, biking and the use of public transit.

This study identifies the current pathways for retired EV batteries in the United States and Canada and anticipates how the network might evolve in the future.

This research uses system dynamics modeling to project future electric vehicle adoption and second-hand vehicle trade between the US and Mexico.

This study examined the impact of replacing the Vermont state fuels tax with a revenue-neutral, mileage-based user fee using mileage and fuel economy data for over 300,000 registered passenger vehicles.

This study uses data from bike-share user surveys in the Sacramento region to perform market segmentation based on perceptions of the bike-share service, mode use patterns, and bike-share use.

The goal of this project was to document on-the-ground changes in the built environment in selected communities over a two-decade period and assess whether changes in VMT have occurred over the same period. A secondary aim was to explore the contribution of local and/or regional policy change and public investments such as transit, bike, and pedestrian infrastructure as well as private development investments to the observed on-the-ground changes to the built environment.

This mixed-methods dissertation explores questions related to the governance landscape and the institutional and political factors that surround highway expansion projects.

This paper addresses asks and answers the following questions: (1) What are the scope and scale of rural car access in the U.S. and what are the factors associated with not having a car? (2) How do rural carless residents get around relative to their nonrural peers? (3) What are the consequences of not having car access in rural areas?

This study investigates the potential ramifications of e-commerce on shopping behaviors, travel, and residential deliveries by the year 2050. The study underscores the significance of contemplating the implementation of clean energy fleets and effective transportation strategies to mitigate the negative externalities related to shopping activities.

The report explores the necessity to correctly estimate the preference for vehicle holdings of households as well as the vehicle miles traveled by vehicle body- and fuel-type to project future Vehicle Miles Traveled changes and mobile source emission levels. The report presents the application of a utility-based model for multiple discreteness that combines multiple vehicle types with usage in an integrated model, specifically the MDCEV model.

This project uses high-frequency data from the Los Angeles metropolitan area combined with an instrument that varies spatially and temporally to estimate the causal impact of an additional vehicle mile traveled on travel times. The researchers estimate that at peak times an additional trip reduces speed by, on average, 0.22%. They find the optimal toll at peak times is 33 cents per mile, with the toll being lower, even zero, off-peak.

This study explores interest in, and the challenges faced by transit agencies and operators in the adoption of open-loop payment systems.

This dissertation presents a comprehensive investigation into the co-optimization of vehicle trajectories and traffic signal timing at isolated signalized intersections.

This dissertation focuses on the assessment of technical feasibility and economic workability of BEVs in a variety of heavy-duty on- and off-road applications.In the on-road HDV segment, battery electric trucks (BETs) have become commercially available in recent years, but their ability to operate at the same level as conventional diesel trucks was unclear.

This study helps understand how the anticipated emergence of CAVs will affect various aspects of society and transportation, including travel demand, vehicle miles traveled, energy consumption, and emissions of greenhouse gases and other pollutants. The research team designed a set of future system configurations under the California Statewide Travel Demand Model framework to simulate scenarios for the deployment of passenger CAVs in California by 2050.

Unrestricted charging of electric vehicles (EVs) can result in violations of the grid’s operating limits, and/or equipment damage or failure. To address this, the researchers propose a two-stage smart charging algorithm for EVs in single-family residences.