Projects and Grants per year
Personal profile
Education/Academic qualification
Doctor of Philosophy, University College London
2016
Master of Science in Civil Engineering, Northwestern University
2002
Bachelor of Science in Civil Engineering, Cornell University
2000
External positions
Senior Advisor, Metropolitan Transportation Commission
2023 → …
Expertise related to UN Sustainable Development Goals
In 2015, UN member states agreed to 17 global Sustainable Development Goals (SDGs) to end poverty, protect the planet and ensure prosperity for all. This person’s work contributes towards the following SDG(s):
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SDG 8 Decent Work and Economic Growth -
SDG 9 Industry, Innovation, and Infrastructure -
SDG 11 Sustainable Cities and Communities -
SDG 15 Life on Land
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Dive into the research topics where Greg Erhardt is active. These topic labels come from the works of this person. Together they form a unique fingerprint.
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Collaborations and top research areas from the last five years
Recent external collaboration from the last 5 years on country level. Dive into details by clicking on the dots.
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Account PL 63, Assessment of KY Traffic Forecasts: Match to 3200005710
Erhardt, G. (PI)
8/1/25 → 6/30/27
Project: Research project
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TRB Transit IDEA: Medium-Term Ridership Forecasting
Erhardt, G. (PI)
1/10/25 → 12/31/26
Project: Research project
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Historical Accuracy of Traffic Forecasts and Induced Travel
Erhardt, G. (PI), Chen, M. (CoI) & Gold, H. (CoI)
University of California Davis
1/1/25 → 3/19/27
Project: Research project
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NSF SAI: A Linked Longitudinal American Community Survey Sub-Sample to Understand Commuting Behavior
Erhardt, G. (PI) & Bollinger, C. (CoI)
9/15/24 → 8/31/27
Project: Research project
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Do transportation network companies decrease or increase congestion?
Erhardt, G. D., Roy, S., Cooper, D., Sana, B., Chen, M. & Castiglione, J., 2019, In: Science advances. 5, 5, eaau2670.Research output: Contribution to journal › Article › peer-review
Open Access -
The changing accuracy of traffic forecasts
Hoque, J. M., Erhardt, G. D., Schmitt, D., Chen, M., Chaudhary, A., Wachs, M. & Souleyrette, R. R., Apr 2022, In: Transportation. 49, 2, p. 445-466 22 p.Research output: Contribution to journal › Article › peer-review
Open Access -
Why has public transit ridership declined in the United States?
Erhardt, G. D., Hoque, J. M., Goyal, V., Berrebi, S., Brakewood, C. & Watkins, K. E., Jul 2022, In: Transportation Research Part A: Policy and Practice. 161, p. 68-87 20 p.Research output: Contribution to journal › Article › peer-review
Open Access -
Demand-dependent Transit Fare Structure to Alleviate Peak-hour Crowding
Jin, Z., Erhardt, G. & Moeckel, R., 2026, In: Transportation Research Procedia. 95, p. 1064-1071 8 p.Research output: Contribution to journal › Conference article › peer-review
Open Access -
Identifying ridehail riders through pairing ActivitySim and BEAM
MacFarlane, G. S., Day, C., Erhardt, G. D. & Watkins, K. E., 2026, In: Procedia Computer Science. 280, p. 286-293 8 p.Research output: Contribution to journal › Conference article › peer-review
Open Access
Prizes
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Certificate of Appreciation in recognition of leadership in advancing the science of travel demand modeling
Erhardt, G. (Recipient), 2018
Prize: Honorary award
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