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research report | September 2026

research report | December 2024

Stephen G. Ritchie, Andre Y.C. Tok, Tanjeeb Ahmed and Mingqi Yao (2024) Route-based Freight Activity Metrics along the California State Highway System through a Pilot Multi Sensor Fusion System. Final Report PSR-23-03 TO 073. PSR / ITS-Irvine.

conference paper | May 2026

conference paper | January 2021

Mingqi Yao, Suman K. Mitra and Stephen G. Ritchie (2021) “Heterogeneities in Older Adults Travel Times and Activity Durations: Analysis of the 2017 NHTS Personal Trip Data”. Washington, DC.

research report | January 2026

research report | December 2023

Craig Rindt, Mingqi Yao, Naila Sharmeen, Andre Tok, Stephen G. Ritchie, Blake Lane, Kate Forrest, Mike MacKinnon, Scott Samuelsen, Bo Liu, Kanok Boriboonsomsin, Abdullah Fuad Un-Noor, Suman Mitra, Farzana Mehzabin Tuli and Vuban Chowdhury (2023) Low-Carbon Transportation Incentive Strategies Using Performance Evaluation Tools for Heavy-Duty Trucks and Off-Road Equipment. Draft Final Report. California Air Resources Board / Institute of Transportation Studies, UC Irvine.

published journal article | December 2025

published journal article | December 2021

Suman Mitra, Mingqi Yao and Stephen G. Ritchie (2021) “Gender differences in elderly mobility in the United States”, Transportation Research Part A: Policy and Practice, 154, pp. 203–226.

conference paper | December 2025

conference paper | January 2020

Suman Mitra, Mingqi Yao and Stephen Ritchie (2020) “Gender differences in travel patterns of the elderly in the united states”, in Proceedings of the 99th annual meeting of the transportation research board.

conference paper | December 2025

conference paper | January 2025

Mingqi Yao and Stephen Ritchie (2025) “Analyzing Public Sentiment Variations Toward Electric Vehicles in the United States: Evidence from Twitter”, in Proceedings, 104th Annual Meeting of the Transportation Research Board. Washington, D.C..

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