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Sponsor: RIMI

Risk Assessment for Security Threats and Vulnerabilities of Autonomous Vehicles

Status

Complete

Project Timeline

July 22, 2022 - October 31, 2023

Principal Investigator

Qi Alfred Chen

Project Team

Ziwen Wan

Sponsor, Program & Award Number

RIMI: RIMI-5B-03
(Also see the UC ITS page)

Areas of Expertise

Intelligent Transportation Systems, Emerging Technologies, & Big Data Safety, Public Health, & Mobility Justice

Team Departmental Affiliation

Information and Computer Science

Project Summary

In the coming decades, advancements in connected and automated vehicles (CAVs) have the potential to transform communities and mobility. As these technologies progress, policymakers and practitioners will need tools and information to proactively design policies, actions, and practices that will avoid potential negative impacts and unintended consequences and facilitate sustainable and equitable outcomes. This white paper project will summarize and classify realistic CAV-related security threats and vulnerabilities with the goal of helping stakeholders identify research needs, barriers to implementation, and strategies to address such issues. This will be accomplished by first conducting an extensive review of CAV system security vulnerabilities (e.g., sensing, control, artificial intelligence, networking, and computing). Second, the researchers will classify these threats based on common characteristics from a policymaker perspective and identify strategies to mitigate threats.

Related Publications

policy brief | Apr 2024

How Risky Are Cyber Security Threats Against Autonomous Vehicles?

Read more
research report | Apr 2024

Risk Assessment for Security Threats and Vulnerabilities of Autonomous Vehicles

Read more

Rail Transit Ridership in California: Lessons Learned from Station Area Assessments

Status

Complete

Project Timeline

February 22, 2022 - December 31, 2023

Principal Investigator

Michael McNally

Sponsor, Program & Award Number

RIMI: RIMI-4D

Areas of Expertise

Public Transit, Shared Mobility, & Active Transportation Travel Behavior, Land Use, & the Built Environment

Team Departmental Affiliation

Civil and Environmental Engineering

Project Summary

Emerging evidence shows that rail transit ridership has recuperated unevenly—at different rates in different places—as California has emerged from the COVID-19 pandemic. Stations that serve central business districts, for example, show slower gains in rail transit passengers compared to stations with mixed income residents and mixed uses in suburban locations. It is not yet clear what is causing this difference, but this disparity signals that post-COVID ridership will be different from what was observed in the past, and some station areas will likely need to develop strategies that account for this new reality. This study examines how various characteristics (e.g., land use, development density, the pedestrian environment) affect transit ridership pre- and post-COVID and how they differ across station types based on longitudinal data for 242 rail stations belonging to Bay Area Rapid Transit, San Diego Metropolitan Transit System, Sacramento Regional Transit, and LA Metro between 2019 and 2021. Key findings include an overall 72% decrease in station-level ridership, but changes were not uniform. Station areas with a higher number of low-income workers and more retail or entertainment jobs tend to have lower ridership declines, while areas with a large number of high-income workers, high-wage jobs, and higher job accessibility by transit had more ridership losses.

Related Publications

research report | Sep 2024

Rail Transit Ridership Changes in COVID-19: Lessons from Station Area Characteristics

Read more
published journal article | Dec 2025

Rail transit ridership changes in COVID-19: Lessons for station area planning in California
Journal of Urban Mobility

Read more
policy brief | Sep 2024

Decline of Rail Transit Requires New Strategies

Read more

Benefits, Challenges, and Opportunities of Different Last-Mile Delivery Strategies

Status

Complete

Project Timeline

June 1, 2022 - March 1, 2024

Principal Investigator

Michael HylandMichael Hyland

Project Team

Jean-Daniel Saphores, Younghun Bahk

Sponsor, Program & Award Number

RIMI: RIMI-3H

Areas of Expertise

Freight, Logistics, & Supply Chain

Team Departmental Affiliation

Civil and Environmental Engineering

Project Summary

The rapid growth of e‐commerce and has had significant impacts on the way consumers shop and on the logistics behind delivering the products they order. This shift has resulted in significant changes for retail as well as for business-to-business, business-to-consumer, and consumer-to-consumer distribution. Overall, supply chain structures have been modified to allow for the efficient flow of goods to satisfy the needs of today’s rapid delivery services. This project focuses on the end of the distribution process–the last mile–where changes in consumer shopping behaviors have resulted in changes in related travel behaviors. When California developed its Sustainable Freight Action Plan, it missed an opportunity to consider the relevance of the last mile distribution and e‐commerce segment. The last two years have demonstrated how important this segment is, not only for the economy, but also for delivering much‐needed goods to the people. This growing segment is stressing local infrastructure and generating congestion, pollution, and other negative effects. At the same time, it is the segment that could help the state’s decarbonization efforts because its characteristics may offer opportunities for the introduction and use of cleaner technologies. This project will evaluate the success of innovative and emerging last mile technologies and services in responding to changes in demand. It will also quantify the role of these services in reducing the environmental footprint of last mile logistics. This study leverages the extensive work conducted by the research teams at the Universities of California, Davis and Irvine on freight modeling in general, and on e‐commerce and consumer behavior in particular. Building on this past work, this research will explore the benefits and drawbacks of new technologies and innovations in last mile distribution operations and investigate what innovations, regulations, and infrastructure changes are needed to contend with changes in shopping and travel behavior. The team will synthesize the findings of the previous research and integrate the results into new rounds of simulation and optimization modeling while paying particular attention to key inputs. Researchers will also identify gaps in the modeling efforts and establish the unanswered questions, e-commerce- and travel-related issues, and policies that existing methodologies cannot address. Finally, the team will evaluate the system and regulatory requirements conducive to the best performance and compare them to existing conditions.

Related Publications

policy brief | Sep 2025

New Innovative Last-Mile Delivery Strategies Have Environmental and Equity Benefits, But There Can be Trade-Offs

Read more
published journal article | Sep 2025

Assessing the sustainability of last-mile distribution strategies to manage expedited shipping with dynamic and stochastic demand
Transportation Research Part E: Logistics and Transportation Review

Read more
published journal article | Apr 2024

Electric vehicles in urban delivery fleets: How far can they go?
Transportation Research Part D: Transport and Environment

Read more
research report | Jan 2025

Benefits, Challenges, and Opportunities of Different Last-Mile Delivery Strategies

Read more

Examining the Statewide Impact of Vehicle Grid-Integration Strategies on California’s Future Electricity Grid

Status

Complete

Project Timeline

March 1, 2022 - February 29, 2024

Principal Investigator

Stephen Ritchie

Project Team

Behdad Kiani

Sponsor, Program & Award Number

RIMI: RIMI-3K

Areas of Expertise

Zero-Emission Vehicles & Low-Carbon Fuels

Team Departmental Affiliation

Civil and Environmental Engineering

Project Summary

As California nears 1 million electric vehicles (EVs) on the road with a goal of 5 million by 2030, the ability of the state electricity grid to support charging these vehicles must be carefully studied and any grid upgrades must be meticulously planned. In addition to representing a significant new energy load for California utilities, these millions of EVs have the potential to provide a tremendous resource through vehicle-to-grid (V2G) power. EVs can store energy, provide flexible load and demand response, provide emergency backup power, and offer ancillary services that stabilize distribution grid operations. How do these benefits at the utility grid level translate to statewide electricity grid benefits? And how can flexible loads from EVs and V2G power help the California Independent System Operator (CAISO) manage the future California grid? This project will examine future scenarios of EV market penetration in California utility territories and address questions related to regional and statewide grid impacts and opportunities. The project will assess current policy and make recommendations for future development of EV-grid market rules, regulations, and rate structures. It will examine questions about the equity and fairness of proposed “dynamic” utility rate structures for residents of single-family homes and multi-unit dwellings, and will examine geographic differentiation of more elaborate future utility rate and CAISO market structures.

Related Publications

white paper | Feb 2025

Electric Vehicle Charge Management Strategies to Benefit the California Electricity Grid

Read more
op-ed | Sep 2023

How California can use electric vehicles to solve its blackouts

Read more
policy brief | Oct 2024

Policy Considerations for Advancing Bidirectional Electric Vehicle Charging in California

Read more
presentation | Apr 2024

Electric Vehicle-Grid Integration Concepts and Recent Studies

Read more

Streamlining the CEQA Process in Transit Rich Areas

Status

Complete

Project Timeline

June 14, 2022 - March 31, 2024

Principal Investigator

Nicholas Marantz

Sponsor, Program & Award Number

RIMI: RIMI-4N

Areas of Expertise

Travel Behavior, Land Use, & the Built Environment

Team Departmental Affiliation

Urban Planning and Public Policy

Project Summary

California faces major policy challenges that stem in part from decades of planning for automobility. For one, the state cannot meet its ambitious decarbonization targets without reducing greenhouse gas (GHG) emissions from the transportation sector, which produces nearly 40 percent of California’s emissions. Substantial reductions in vehicle miles traveled (VMT) are likely needed to meet the state’s climate change goals. In addition, the state is mired in a historic housing supply and affordability crisis. It ranks 49th in the United States in housing units per capita. It needs millions more units to meet demand, including 1.3 million more affordable rental units, according to one estimate. Transit oriented development (TOD), with denser housing around transit hubs, can solve both challenges—reducing driving and producing more housing. However, TOD is often difficult to achieve in practice. One frequently cited roadblock to TOD is the environmental review process under the California Environmental Quality Act (CEQA), which can add considerable time, cost, and uncertainty to TOD plans and developments. There have been numerous attempts to exempt or provide a streamlined CEQA review process for TOD projects, including through Senate Bill (SB) 375 projects (and infill developments generally). These efforts are often “criticized for layering on so many project level restrictions that no developments succeed in meeting all the eligibility requirements.” However, there is limited empirical research on how frequently the provisions have actually been used or how successful they have been at streamlining the entitlement process for TOD projects. This research project will explore the use and effect of the two CEQA streamlining provisions in SB 375 for TOD projects. One provision exempts qualifying transit priority projects (TPPs) from CEQA review entirely (Public Resources Code § 21155.1). The other provision streamlines CEQA review for qualifying TPPs (Public Resources Code § 21155.2). The researchers will catalog projects that have utilized these provisions, identify projects that likely could have taken advantage of SB 375 CEQA streamlining but did not, and interview planners and developers involved with a subset of both sets of projects. The outcome will be an in-depth exploration of how much SB 375 streamlining actually helps reduce the time, cost, and uncertainty of permitting TOD projects, and how it could be improved to better meet those goals.

Related Publications

published journal article | Mar 2025

Can governments streamline environmental impact analysis to promote transit-oriented development? Evidence from California
Journal of Transport and Land Use

Read more
presentation | Apr 2024

Streamlining the Permitting Process for Transit-Oriented Development: The Case of California's Senate Bill 375

Read more

Connecting Telework, Travel Behavior, and System Performance During the COVID-19 Pandemic

Status

Complete

Project Timeline

November 16, 2022 - June 30, 2024

Principal Investigator

Michael McNally

Project Team

Rezwana Rafiq, Chenying Qin

Sponsor, Program & Award Number

RIMI: RIMI-4L-03

Areas of Expertise

Infrastructure Delivery, Operations, & Resilience Travel Behavior, Land Use, & the Built Environment

Team Departmental Affiliation

Civil and Environmental Engineering

Project Summary

The COVID-19 pandemic and the imposed social distancing measures led many workers to adopt telecommuting—working from home—arrangements on a large scale. The massive changes in work activity may have long-term impacts on domestic and travel behavior, including how people organize their work, where that work is performed, how activities and travel are scheduled, and what travel mode is used. Telework has been touted as a potentially effective travel demand management strategy as well as an environmental management tool for reducing travel and greenhouse gas emissions under Senate Bill 375. The COVID-19 pandemic and associated travel restrictions, despite creating immense disruption to people's lives, also offered an opportunity to experience how telework policies and practices can affect daily travel, should it remain a significant part of the work landscape. This study considers how telecommuters have responded to the changes in activity-travel scheduling and time allocation. In particular, it considers how workers utilized time during the pandemic by comparing workers who telecommuted with workers who continued to commute. Commuters were segmented into those who worked in telecommutable jobs (potential telecommuters) and those who did not (commuters). Findings from this work suggest that telecommuters exhibited distinct activity participation and time use patterns from the commuter groups. This study also supports the basic hypothesis that telecommuters were more engaged with in-home versus out-of-home activity compared to potential telecommuters and commuters. In terms of activity time-use, telecommuters spent less time on work activity but more time on caring for household members, household chores, eating, socializing and recreation activities than their counterparts. During weekdays, a majority of telecommuters did not travel and in general this group made fewer trips per day compared to the other two groups. Compared to telecommuters, potential telecommuters made more trips on both weekdays and weekends while non-telecommutable workers made more trips only on weekdays. The findings of this study provide initial insights on time-use and the associated activity-travel behavior of both telecommuter and commuter groups during the pandemic.

Related Publications

working paper | Jul 2024

A Comparison of Time-use for Telecommuters, Potential Telecommuters, and Commuters during the COVID-19 Pandemic

Read more

Analyzing Cross-Border Truck Activity to Inform California’s Transition to Zero-Emission Trucks

Status

In Progress

Project Timeline

September 25, 2023 - March 31, 2026

Principal Investigator

Stephen Ritchie

Project Team

Andre (Yeow Chern) Tok

Sponsor, Program & Award Number

RIMI: 2024-37-5O
(Also see the UC ITS page)

Areas of Expertise

Freight, Logistics, & Supply Chain

Team Departmental Affiliation

Civil and Environmental Engineering

Project Summary

California has three major truck border crossings with Mexico, averaging 4,000 trucks in each direction daily. Over 90% of these border crossings are made by Mexican-domiciled motor carriers. The Advanced Clean Fleets (ACF) regulation mandates that these trucks transition to zero-emission vehicles (ZEVs), necessitating new fueling infrastructure, including battery charging and hydrogen stations. The transition to medium- and heavy-duty ZEVs is a significant concern at both state and federal levels. Currently, there's a lack of data on the environmental impact and activity of border-crossing trucks. Moreover, several AB 617 communities, selected by the California Air Resources Board (CARB) for its Community Air Protection Program, are heavily affected by truck emissions near the border crossings. The most impacted are the Calexico-El Centro-Heber Community near the Calexico Border Crossing and the International Border Community near the Otay Mesa Border Crossing. Mexican trucks entering California often have dual license plate registrations. However, automated license plate readers can effectively recognize only one of the two plates, making it impossible to determine which trucks have dual registrations from a single captured plate. This data gap hinders the understanding of fleet characteristics, such as age distribution and fleet size, which CARB needs to estimate the emissions profile of Mexican trucks in California. Also, Mexican-based trucks engage in drayage and long-haul movements through Southern California to Arizona and Nevada, but little is known about their activity distribution. This lack of data affects the ability to plan infrastructure investments for the transition of Mexican trucks to zero-emission technologies in the future. This project involves a synergistic multicampus effort to collect two complementary datasets that will elucidate heavy-duty truck border crossing characteristics and activity. UC Irvine will pilot a new license plate reader algorithm designed specifically to identify and capture the dual license plate registrations of Mexican trucks crossing into California. The system will be deployed to monitor the entry and exit of trucks at Otay Mesa and Calexico and will be integrated with other advanced technologies such LiDAR and inductive loop signatures. The integration of these technologies will allow UC Irvine to identify critical truck characteristics, such as the year, make and model of the vehicle. UC Riverside will recruit fleet operators on both sides of the California-Mexico border to participate in GPS truck data collection. The data collection will target trucks that frequently cross the border in short- and long-haul applications. UC Riverside researchers will then analyze the data for truck activity information, such as travel distance, travel time, and fuel consumption at both the trip- and the tour-level. Taken together, the data collected in this study will help CARB understand the impact of the ACF on border communities and highlight the grid infrastructure needs for the transition to ZEV trucks at the border.

Flight Operations for Noise and Energy Efficient UAM/AAM

Status

Complete

Project Timeline

June 10, 2022 - June 30, 2025

Principal Investigator

Jacqueline (Jacquie) Huynh

Project Team

Trinity Lee

Sponsor, Program & Award Number

RIMI: RIMI-5C-02
(Also see the UC ITS page)

Areas of Expertise

Intelligent Transportation Systems, Emerging Technologies, & Big Data

Team Departmental Affiliation

Mechanical and Aerospace Engineering

Project Summary

This project will examine noise and energy efficient AAM/UAM flight operations. Various AAM and UAM aircraft are being proposed in industry and their operations and noise impacts must be considered for implementation into the National Airspace. AAM configurations can feature unique operating modes, such as blown lift for short takeoff and landing aircraft (STOL). A first principles flight procedure and noise modeling approach will be implemented for different operating modes for the conceptual design of low noise flight operations for these vehicles.

Related Publications

conference paper | Jul 2024

Impact of Flight Trajectory Design on Performance and Noise for AAM Aircraft
AIAA AVIATION FORUM AND ASCEND 2024

Read more
policy brief | Dec 2025

Balancing Noise, Energy, and Time: Designing Advanced Air Mobility Operations for Urban Integration

Read more

Pilot Study: Freight Mobility Living Laboratory

Status

Complete

Project Timeline

July 22, 2022 - June 30, 2025

Principal Investigator

Stephen Ritchie

Project Team

Andre (Yeow Chern) Tok

Sponsor, Program & Award Number

RIMI: RIMI-5J
(Also see the UC ITS page)

Areas of Expertise

Freight, Logistics, & Supply Chain

Team Departmental Affiliation

Civil and Environmental Engineering

Project Summary

California possesses multiple major freight gateways and logistics facilities that serve both the state and the entire US. But the economic, environmental and local community impacts of heavy-duty trucks that are currently essential to supply chains and the freight transportation system remain poorly measured due to the lack of comprehensive and detailed truck activity data. This wide-scale pilot study will deploy the Truck Activity Monitoring System (TAMS) developed at ITS-Irvine to create a freight mobility living laboratory (FML2). TAMS primarily uses advanced inductive signature technology with existing infrastructure, supplemented by LiDAR sensors and automated license plate recognition at selected sites to provide detailed data on real-time heavy-duty truck activity along major freight corridors. FML2 will initially focus on the Inland Empire area of Southern California (Caltrans District 8), along with limited deployments in other Caltrans Districts.

Related Publications

published journal article | Sep 2024

Real-time truck characterization system: A pilot implementation of the Freight Mobility Living Laboratory (FML2)
Transportation Research Interdisciplinary Perspectives

Read more

Managing and Operating Through Uncertainty in Air Traffic Control and Air Traffic Management

Managing and Operating Through Uncertainty in Air Traffic Control and Air Traffic Management

Abstract

Air traffic control (ATC) and air traffic management (ATM) operate across multiple timescales and decision layers, yet both are fundamentally shaped by uncertainty arising from weather, capacity disruptions, and human decision-making. In this talk, I present two complementary research projects, one focused on air traffic control (ATC) and the other on air traffic management (ATM), that together offer a unified perspective on how uncertainty can be explicitly modeled and managed across tactical ATC operations and strategic ATM planning. At the tactical ATC level, we study pathfinder operations during convective weather and develop a decision-theoretic framework that captures stochastic airspace availability, flight acceptance behavior, and pathfinder sequencing. We show that the proposed models yield rich insights into system behavior and inform the design of operational decision support tools. At the strategic ATM level, we address uncertainty in airport ground delay programs through a distributionally robust optimization framework that hedges against capacity mis-specification and demonstrates strong out-of-sample performance using data from the US National Airspace System. Together, these results show how explicit uncertainty modeling across ATC and ATM decision layers can improve robustness and operational performance.

Max is an Assistant Professor of Aerospace Engineering at the University of Michigan, Ann Arbor. He also has courtesy appointments in Civil and Environmental Engineering as well as Industrial and Operations Engineering. Max received his PhD in Aerospace Engineering from the Massachusetts Institute of Technology in 2021. He received his MSE in Systems Engineering and BSE in Electrical Engineering and Mathematics, both from the University of Pennsylvania, in 2018. Max’s research and teaching interests include air transportation systems, airport and airline operations, Advanced Air Mobility, networked systems, as well as optimization and control.

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