Gregory D. Erhardt

University of Kentucky — United States

Social Sciences · Social Sciences

14h-index1.1kcitations80works2.02yr avg
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Research Topics

Transportation Planning and Optimization(55), Transportation and Mobility Innovations(32), Urban Transport and Accessibility(31), Human Mobility and Location-Based Analysis(14), Traffic Prediction and Management Techniques(12)

Publications80 total

Do Transportation Network Companies (TNCs) improve or worsen road safety? Assessing crash impacts in San Francisco
Journal of Safety Research·2025Open Access
How much should this ride cost? Pricing ride-hailing trips to complement and not compete with transit
SSRN Electronic Journal·2025Open Access
Are public transit investments based on accurate forecasts? An analysis of the improving trend of transit ridership forecasts in the United States
Transportation Research Part A Policy and Practice·2024· 3 cited
Estimating and Implementing a Vehicle-Type Model in an Activity-Based Travel Model Framework
Transportation Research Record Journal of the Transportation Research Board·2024
Simulating the effect of strategies to increase transit ridership by reallocating bus service: Two case studies
Journal of Public Transportation·2024· 2 citedOpen Access
The Activity-based model ABIT: Modeling 24 hours, 7 days a week
Transportation research procedia·2024· 7 citedOpen Access
Understanding Ride-Hailing Sharing and Matching in Chicago Using Travel Time, Cost, and Choice Models
Transportation Research Record Journal of the Transportation Research Board·2023· 8 cited
Intersections Between Mobility and Communications
Networks and Spatial Economics·2023Open Access
Are Public Transit Investments Based on Accurate Forecasts? An Analysis of the Improving Trend of Transit Ridership Forecasts in the United States
SSRN Electronic Journal·2023· 2 citedOpen Access
The impact of male-led training on changing gender perceptions: Early results from Advocates and Allies training sessions in the USA and Germany
2023Open Access
Sizing Considerations for EV Dynamic Wireless Charging Systems with Integrated Energy Storage
2022· 3 citedOpen Access
Why has public transit ridership declined in the United States?
Transportation Research Part A Policy and Practice·2022· 123 citedOpen Access
Ride-Hailing Data Suppression and Exclusion Strategies Can Lead to Biased Outcomes
Findings·2022· 3 citedOpen Access
Investigating the Ridership Impact of New Light-Rail Transit and Arterial Bus Rapid Transit Lines in the Twin Cities
Transportation Research Record Journal of the Transportation Research Board·2022· 5 cited
Recent Decline in Public Transportation Ridership: Hypotheses, Methodologies, and Detailed City-by-City Results
Transportation Research Board eBooks·2022
Using Probe-Based Speed Data and Interactive Maps for Long-Term and COVID-Era Congestion Monitoring in San Francisco
Transportation Research Record Journal of the Transportation Research Board·2022· 3 cited
The impacts of shared e-scooters on bus ridership
Transportation Research Part A Policy and Practice·2021· 63 cited
Recent Decline in Public Transportation Ridership: Analysis, Causes, and Responses
Transportation Research Board eBooks·2021· 20 cited
Estimating the uncertainty of traffic forecasts from their historical accuracy
Transportation Research Part A Policy and Practice·2021· 20 citedOpen Access
A Latency-Defined Edge Node Placement Scheme for Opportunistic Smart Cities
2021· 4 cited
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Frequent Co-authors

Jawad Mahmud Hoque(7), Mei Chen(6), Joe Castiglione(6), Richard Alexander Mucci(6), Joel Freedman(6), Bhargava Sana(5), Candace Brakewood(5), Kari Watkins(5), David R. Schmitt(5), Drew Cooper(4), Simon Berrebi(4), Sneha Roy(3), Vedant Goyal(3), Martín Wachs(3), William Charlton(3), Jeffrey Hood(3), Oluwashina Madamori(3), Esther Max-Onakpoya(3), Corey E. Baker(3), Erik E Sabina(3)