Gregory D. Erhardt

1.2k total citations · 1 hit paper
39 papers, 787 citations indexed

About

Gregory D. Erhardt is a scholar working on Transportation, Automotive Engineering and Building and Construction. According to data from OpenAlex, Gregory D. Erhardt has authored 39 papers receiving a total of 787 indexed citations (citations by other indexed papers that have themselves been cited), including 34 papers in Transportation, 19 papers in Automotive Engineering and 10 papers in Building and Construction. Recurrent topics in Gregory D. Erhardt's work include Transportation Planning and Optimization (32 papers), Urban Transport and Accessibility (20 papers) and Transportation and Mobility Innovations (18 papers). Gregory D. Erhardt is often cited by papers focused on Transportation Planning and Optimization (32 papers), Urban Transport and Accessibility (20 papers) and Transportation and Mobility Innovations (18 papers). Gregory D. Erhardt collaborates with scholars based in United States, United Kingdom and Germany. Gregory D. Erhardt's co-authors include Joe Castiglione, Bhargava Sana, Drew Cooper, Mei Chen, Sneha Roy, Kari Watkins, Candace Brakewood, Simon Berrebi, Joel Freedman and Mei Chen and has published in prestigious journals such as SHILAP Revista de lepidopterología, Science Advances and Transportation Research Part A Policy and Practice.

In The Last Decade

Gregory D. Erhardt

37 papers receiving 752 citations

Hit Papers

align trajectories

What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if it has ≥500 total citations, achieves ≥1.5× the top-1% citation threshold for papers in the same subfield and year (this is the minimum needed to enter the top 1%, not the average within it), or reaches the top citation threshold in at least one of its specific research topics.

Do transportation network companies decrease or increase congestion?

2019 306 citations Gregory D. Erhardt, Sneha Roy et al. profile →

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name	h						Papers	Cites
Gregory D. Erhardt United States	12	650	554	168	139	45	39	787
Joe Castiglione United States	11	663 1.0×	510 0.9×	154 0.9×	131 0.9×	50 1.1×	20	790
Bhargava Sana United States	10	530 0.8×	426 0.8×	150 0.9×	79 0.6×	23 0.5×	21	662
Menno Yap Netherlands	12	585 0.9×	384 0.7×	68 0.4×	149 1.1×	63 1.4×	29	752
Rico Krueger Australia	10	601 0.9×	729 1.3×	210 1.3×	92 0.7×	47 1.0×	26	964
Frank Douma United States	12	291 0.4×	231 0.4×	132 0.8×	173 1.2×	34 0.8×	40	516
Rita Cyganski Germany	12	356 0.5×	354 0.6×	69 0.4×	70 0.5×	50 1.1×	32	512
John Attanucci United States	11	756 1.2×	250 0.5×	66 0.4×	228 1.6×	35 0.8×	37	858
Corey D. Harper United States	7	348 0.5×	499 0.9×	84 0.5×	92 0.7×	68 1.5×	25	623
Neema Nassir Australia	15	650 1.0×	328 0.6×	75 0.4×	284 2.0×	117 2.6×	58	869
Krishna Murthy Gurumurthy United States	13	383 0.6×	539 1.0×	184 1.1×	83 0.6×	94 2.1×	34	609

Countries citing papers authored by Gregory D. Erhardt

Since Specialization

Citations

This map shows the geographic impact of Gregory D. Erhardt's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Gregory D. Erhardt with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Gregory D. Erhardt more than expected).

Fields of papers citing papers by Gregory D. Erhardt

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Gregory D. Erhardt. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Gregory D. Erhardt. The network helps show where Gregory D. Erhardt may publish in the future.

Co-authorship network of co-authors of Gregory D. Erhardt

This figure shows the co-authorship network connecting the top 25 collaborators of Gregory D. Erhardt. A scholar is included among the top collaborators of Gregory D. Erhardt based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with Gregory D. Erhardt. Gregory D. Erhardt is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

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20 of 20 papers shown

Schmitt, David R., et al.. (2024). 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. 186. 104142–104142. 1 indexed citations

Moeckel, Rolf, et al.. (2024). The Activity-based model ABIT: Modeling 24 hours, 7 days a week. Transportation research procedia. 78. 499–506. 2 indexed citations

Erhardt, Gregory D., et al.. (2024). Simulating the effect of strategies to increase transit ridership by reallocating bus service: Two case studies. Journal of Public Transportation. 26. 100080–100080. 1 indexed citations

Erhardt, Gregory D., et al.. (2023). Understanding Ride-Hailing Sharing and Matching in Chicago Using Travel Time, Cost, and Choice Models. Transportation Research Record Journal of the Transportation Research Board. 2678(2). 293–306. 3 indexed citations

Sana, Bhargava, et al.. (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. 2676(6). 48–60. 2 indexed citations

Berrebi, Simon, Eric M. Lind, Candace Brakewood, Gregory D. Erhardt, & Kari Watkins. (2022). 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. 2676(7). 344–354. 3 indexed citations

Watkins, Kari, et al.. (2021). Recent Decline in Public Transportation Ridership: Analysis, Causes, and Responses. Transportation Research Board eBooks. 14 indexed citations

Erhardt, Gregory D., et al.. (2021). The changing accuracy of traffic forecasts. Transportation. 49(2). 445–466. 14 indexed citations

Erhardt, Gregory D., et al.. (2021). Do transportation network companies increase or decrease transit ridership? Empirical evidence from San Francisco. Transportation. 49(2). 313–342. 65 indexed citations

10.

Erhardt, Gregory D., et al.. (2021). Estimating the uncertainty of traffic forecasts from their historical accuracy. Transportation Research Part A Policy and Practice. 147. 339–349. 11 indexed citations

11.

Erhardt, Gregory D., Mei Chen, Reginald R. Souleyrette, et al.. (2020). Traffic Forecasting Accuracy Assessment Research. Transportation Research Board eBooks. 10 indexed citations

12.

Roy, Sneha, Drew Cooper, Bhargava Sana, et al.. (2020). Why is traffic congestion getting worse? A decomposition of the contributors to growing congestion in San Francisco-Determining the Role of TNCs. Case Studies on Transport Policy. 8(4). 1371–1382. 26 indexed citations

13.

Roy, Sneha, et al.. (2019). The Effect of Transportation Network Companies (TNCs) on Congestion in San Francisco. Transportation Research Board 98th Annual MeetingTransportation Research Board. 3 indexed citations

14.

Erhardt, Gregory D., et al.. (2019). Understanding the Recent Transit Ridership Decline in Major US Cities: Service Cuts or Emerging Modes?. Transportation Research Board 98th Annual MeetingTransportation Research Board. 69 indexed citations

15.

Erhardt, Gregory D., et al.. (2018). Evaluating the Ability of Transit Direct Ridership Models to Forecast Medium-Term Ridership Changes: Evidence from San Francisco. Transportation Research Record Journal of the Transportation Research Board. 2672(46). 21–30. 24 indexed citations

16.

Erhardt, Gregory D., et al.. (2016). Understanding the Potential of Variable Tolling to Smooth Congestion on Downstream Facilities: Applications of a Joint Time-of-Day and Route Choice Model. Transportation Research Record Journal of the Transportation Research Board. 2563(1). 29–39.

17.

Sall, Elizabeth, et al.. (2010). Evaluating Regional Pricing Strategies in San Francisco--Application of the SFCTA Activity-Based Regional Pricing Model. UKnowledge (University of Kentucky). 11 indexed citations

18.

Erhardt, Gregory D., William Charlton, Joe Castiglione, Joel Freedman, & Mark Bradley. (2008). Enhancement and Application of an Activity-Based Travel Model for Congestion Pricing. UKnowledge (University of Kentucky). 8 indexed citations

19.

Erhardt, Gregory D., et al.. (2005). Market-Based Framework for Forecasting Parking Cost in Traditional and Microsimulation Modeling Applications. Transportation Research Record Journal of the Transportation Research Board. 1921(1). 79–88. 1 indexed citations

20.

Erhardt, Gregory D., et al.. (2003). Modeling the Choice to Use Toll and High-Occupancy Vehicle Facilities. Transportation Research Record Journal of the Transportation Research Board. 1854(1). 135–143. 11 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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