Publications

What factors could work as facilitators or barriers in their willingness to adopt microtransit? Who are the early adopters of microtransit? Guided by the theory of planned behavior, this study aims to fill the gap in knowledge by conducting a large-scale survey of microtransit adopters and users of other means of transportation in the Sacramento area of California in 2021.

This research aims to examine barriers to making sustainable travel behavior changes such as using multi-modal transportation, reducing overall amounts of travel, or moving to locations closer to necessary services.

This research project examines the link between job access and stop/station level transit ridership.

Researchers at the University of California, Davis assessed the possibilities for and barriers to providing charging infrastructure for heavy-duty, long-haul trucks at rest areas in California.

A research team at the University of California, Davis examined the track record of the past decade for clues as to why cellulosic fuels that can have a significantly lower carbon footprint per unit energy failed to materialize at commercial scale, and looked forward to 2030 to point to how current policies are likely to still fall short in delivering low-carbon biofuels that can reach scales needed for these hard-to-decarbonize sectors.

This report details the development and application of a spreadsheet tool which enables the evaluation and use of electric and hydrogen Zero Emission Vehicles (ZEVs) within the Caltrans fleet.

Researchers at the University of California, Davis investigated the range of potential impacts that rapid adoption of CAVs in California might have on vehicle miles traveled and emissions.

This thesis reports on understanding factors that influence the performance of Co-solvent Enhanced Lignocellulosic Fractionation (CELF) pretreatment of lignocellulosic biomass with subsequent consolidated bioprocessing (CBP) to maximize product yields at low process severity.

Electrification of diesel cargo handling equipment is one method of reducing community exposure to goods movement and port related emissions, and also provides the potential for reducing greenhouse gas emissions. This study evaluated the performance of several pieces of zero emission cargo transfer equipment for a demonstration conducted at two terminal locations at the Port of Long Beach (POLB).

This project focusses on variable speed limit (VSL) control as an approach to reduce congestion at bottlenecks despite the presence of uncertainties.

The California Department of Forestry and Fire Protection produced a Community Wildfire Prevention and Mitigation Report in 2019 with a methodology to assess wildfire risk. Caltrans and researchers at the University of California, Davis applied these methods to develop a highway-segment-specific prioritization model for vegetation management within highway rights-of-way.

Researchers at the University of California, Davis analyzed the difference in service levels among dock-based and dockless systems in the cities of San Francisco and Los Angeles and analyzed the spatial distribution of service areas, availability of bikes and bike idle times, trip statistics, rebalancing, and other metrics to understand how well or poorly these systems serve designated “communities of concern”.

Community-based carpooling has the potential to alleviate traffic congestion and reduce the transportation carbon footprint. One of the major barriers to implementation is the difficulty of optimizing carpool formation in large systems. This study utilizes two different methods to solve the carpooling optimization problem: 1) bipartite algorithm and 2) integer linear programming.

The transportation sector is responsible for a significant part of the U.S.’s greenhouse emissions, with a considerable amount being generated by medium-and heavy-duty trucks. However, when it comes to the trucking industry, ‘green’ routing studies do not consider other critical practical factors, like working hours regulations and parking availability. This study addresses a variant of the shortest path and truck driver scheduling problem under parking availability constraints which focuses on optimizing fuel consumption and emissions by controlling the truck's travel speed and accounting for time-dependent traffic conditions.

Researchers at the University of Southern California developed a truck routing model that minimizes fuel consumption and reduces emissions while explicitly accounting for parking availability and hours-of-service constraints. The researchers used the model to test various scenarios that reflect the practical constraints faced by drivers.

In this project, the researchers consider the issue of coordinating the parking decisions of a large number of long-haul trucks. More specifically, how to model the behavior of a region’s driver population and how it could be influenced.

This white paper presents three case studies from the San Pedro Bay Ports Clean Air Action Plan (CAAP), including brief analyses of their effects on freight movement in the region. The research helps to illustrate examples of unintended consequences of freight-related environmental measures which will prove useful to policymakers and operators alike.

UC Davis researchers surveyed homeowners in Sacramento and collected lot size and other data to investigate whether the total effective parking supply of the average single-family detached home is sufficient to accommodate the vehicles associated with the residents of both a primary dwelling and a potential ADU.

Researchers at the University of California, Davis partnered with Cal-ITP to study how transit fare payments could be modernized while remaining accessible to unbanked and underbanked riders.

Researchers at the University of California, Davis assessed and scored over 30 CAPs released between 2009 and 2020 based on the degree to which they addressed three themes: emissions reductions, cost, and equity, and developed a set of guiding questions to assist jurisdictions in developing CAPs that include equity considerations both broadly and by specific sector.