Committee on Traffic Flow Theory & Characteristics

Transportation Research Board
National Academy of Sciences


Greenshields Prize

On July 10, 2008 after the successful Greenshields 75 Symposium, the Committee on Traffic Flow Theory and Characteristics established the Greenshields Prize, named in honor of Dr. Bruce D. Greenshields, a pioneer in our field. The committee may award a Greenshields Prize annually for a paper submitted for both presentation and publication through the TRB Annual Meeting paper submission process. The paper review subcommittee will annually forward a set of top papers to the Greenshields Prize subcommittee that will then review the papers and attend the presentations and will determine whether to make a selection after each Annual Meeting. Members of the subcommittee may also add papers for consideration when attending the presentations. The Prize will be announced at the following mid-year meeting and presented at the following Annual Meeting. The selected paper should be in the spirit of Dr. Greenshields’ work, basing sound theory on rigorous empirical analysis and will be reviewed based on these four main criteria:

  • Novelty and originality of material.
  • Experimental support of results.
  • Quality of writing and presentation.
  • Practical applications or implications of the study.
  • The committee will periodically review these criteria and procedures based on actual experience.

    2011 Inaugural Greenshields Prize

    We are pleased to announce the first Greenshields Prize!

    TRB Paper No. 11-4034
    Transportation Research Record No. 2249 pp. 62-77
    Correlated Parameters in Driving Behavior Models: Car-Following Example and Implications For Traffic Microsimulation
    By Ji-Won Kim and Hani S. Mahmassani

    The paper presents a detailed analysis of the existence and extent of such correlation between behavioral parameters in car-following models and its impact on microsimulation results. The correlation is often disregarded when calibrating simulation models because individual parameters are independently and randomly drawn for each driver assuming they are uncorrelated leading to inaccurate output. This study quantifies the impact of ignoring correlation for three representative car-following models and proposes the use of a parametric distribution with known correlation structure to significantly improve the results. Model testing was undertaken using NGSIM datasets. The paper provides guidance on capturing correlation in miscrosimulation and will certainly lead to more accurate calibration procedures in the future.

    2012 Greenshields Prize

    We are pleased to announce the two papers that are the shared recipients of the 2012 Greenshields Prize:

    TRB Paper No. 12-0919
    Transportation Research Record No. 2316, pp. 47-57
    Integrated Lane Change Model with Relaxation and Synchronization
    By Schakel, W.J., Knoop, V.L., and Van Arem, B.

    TRB Paper No. 12-0299
    Transportation Research Record No. 2315, pp 11-24
    Can Results of Car-Following Model Calibration Based on Trajectory Data Be Trusted? 

    By Punzo, V., Ciuffo, B.F., and Montanino, M.

    2013 Greenshields Prize

    We are pleased to announce the Greenshields Prize for 2013. 

    TRB Paper No. 13-4853
    Transportation Research Record No. 2391, pp. 32-43
    Data-Fitted First-Order Traffic Models and Their Second-Order Generalizations 
    By Shimao Fan and Benjamin Seibold

    This paper proposes a cross-comparison of first and second order traffic flow models and assesses their capabilities to accurately reproduce experimental observations on freeways. This paper addresses a very relevant question in the traffic flow theory community because such kind of models are often separately studied and validated. The advantages and drawbacks of first order versus second order models have been debated for a long time within the traffic flow community and this paper provides an elegant contribution to a better definition of the domain of relevance of both approaches. This paper should then contribute to improve the knowledge on best practices when dynamic traffic simulation is needed.

    2014 Greenshields Prize

    We are pleased to announce the Greenshields Prize for 2014. 

    TRB Paper No. 14-0816     
    Transportation Research Record No. XXXX, pp. xx-yy 
    Empirical observations of congestion propagation and dynamic partitioning with probe data for large scale systems      
    By Yuxuan Ji, EPFL; Jun Luo, Shenzhen Institutes of Advanced Technology; Nikolas Geroliminis, EPFL

    This paper presents innovative computational methods to dynamically partition networks into homogeneous sub-regions. This work is supported by extensive data analysis based on 30 to 50 million GPS daily records corresponding to 20,000 taxis for the city of Shenhzen (China). The research shows that homogeneity conditions are not stable during the onset and the offset of congestion at a city scale. This is clearly illustrated with the results of the Macroscopic Fundamental Diagram (MFD) within the different sub-regions. The formation of congestion is modeled by investigating individual links and their connections between multiple dynamic clusters. Contributions from this paper are very significant because they open the door to the application of the MFD concept for designing efficient control strategies by only dynamically adapting the control perimeter. They also highlight that the key parameters (critical flow, critical density,…) of the MFD are remarkably stable when the congested region grows. Moreover, the paper provides the basis for a better understanding of the dynamics of congestion in dense urban areas.

    2015 Greenshields Prize

    Results of the 2015 Greenshields Prize deliberations will be announced in August 2015 at the ISTTT21 in Kobe Japan.


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    Last updated: Thursday, August 14, 2014 9:34 AM
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