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research report | July 2026
research report | July 2026
The Revival of Cargo E-Bikes in the United States: Challenges and Recommendations

Yongsung Lee, Siddhartha Gulhare, Maria Carolina Lecompte, Leon Kang, Giovanni Circella, Miguel Jaller

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policy brief | May 2026
policy brief | May 2026
The Long-term Impacts of the Pandemic on Ride-hailing Use Could Have Negative Environmental Impacts

Patrick Loa, Giovanni Circella, Yongsung Lee

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policy brief | April 2026
policy brief | April 2026
How Did Travel Change after COVID-19? Insights from Northern California Megaregion

Siddhartha Gulhare, Giovanni Circella

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published journal article | February 2026
published journal article | December 2025
Examining Post-pandemic Ride-Hailing Use in California and Its Determinants

Patrick Loa, Yongsung Lee, Giovanni Circella

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preprint journal article | January 2026
preprint journal article | December 2025
Novel Methodology to Identify Factors Causing Heterogeneity in Travel Demand during and after the Pandemic

Siddhartha Gulhare, James Giller, David Bunch, Giovanni Circella

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published journal article | October 2025
published journal article | August 2025
Hybrid Workers’ Activity Intensity: Post-Pandemic Comparison of Telework-Only and in-Person Workdays

Patrick Loa, Yongsung Lee, Giovanni Circella

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published journal article | September 2025
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published journal article | September 2025
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research report | February 2025
research report | October 2024
Changes in Activity-Travel Patterns and Vehicle Ownership During the COVID-19 Pandemic in California

Giovanni Circella, Xiatian Iogansen, Grant Matson, Keita Makino, Yongsung Lee

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policy brief | February 2025
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policy brief | February 2025
policy brief | January 2025
Assessing the Shift to Remote and Hybrid Work in California throughout the COVID-19 Pandemic

Xiatian Iogansen, Yongsung Lee, Giovanni Circella

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research report | September 2024
research report | May 2024
Barriers to Reducing the Carbon Footprint of Transportation Part 2: Investigating Evolving Travel Behaviors in the Post-Pandemic Period in California

Basar Ozbilen, Siddhartha Gulhare, Keita Makino, Aurojeet Jena, Xiatian Iogansen, Patrick Loa, Yongsung Lee, Giovanni Circella

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policy brief | September 2024
policy brief | April 2024
Lessons Learned from Abroad: Potential Influence of California High-Speed Rail on Economic Development, Land Use Patterns, and Future Growth of Cities

Anastasia Loukaitou-Sideris, Giovanni Circella, Maria Carolina Lecompte, Lucia Rossignol

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research report | September 2024
research report | April 2024
Lessons Learned from Abroad: Potential Influence of California High-Speed Rail on Economic Development, Land Use Patterns, and Future Growth of Cities

Anastasia Loukaitou-Sideris, Giovanni Circella, Basar Ozbilen, Maria Carolina Lecompte, Lucia Rossignol

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research report | September 2024
research report | August 2022
Simulating Life with Personally-Owned Autonomous Vehicles through a Naturalistic Experiment with Personal Drivers

Giovanni Circella, Jai Malik, Joan Walker, Mustapha Harb

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research report | September 2024
research report | March 2022
Travel Demand Modeling Methodology Recommendations for the Link21 Program

David Bunch, Giovanni Circella, Jaime Soza Parra, Miguel Jaller, Ran Sun, Tho Le, Xiaodong Quan

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research report | September 2024
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policy brief | September 2024
policy brief | November 2021
Real-World Simulations of Life with an Autonomous Vehicle Suggest Increased Mobility and Vehicle Travel

Giovanni Circella, Jai Malik, Joan Walker, Mustapha Harb

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research report | September 2024
research report | June 2021
Emissions Impact of Connected and Automated Vehicle Deployment in California

Farzad Alemi, Giovanni Circella, Miguel Jaller, Ran Sun

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