Advanced traffic management and control schemes require that traffic simulation models be adequately accurate and computationally efficient in describing traffic flow dynamics. It is proved by practice that the continuum models are more suitable for such purposes. The KRONOS model, developed at the University of Minnesota for traffic flow simulations, is based on a simple continuum formulation implemented by a finite difference method. The results show that the program can be used for transportation planning, design, maintenance operations and freeway management. Although the simple continuum formulation has theoretical elegance and is computationally easy to implement, it requires a lot of data in order to estimate the equilibrium speed-density relationship as one of the state equations in the formulation. Most importantly, the basic modelling of KRONOS is not truly dynamic in nature because the modelling of acceleration/deceleration and inertia effects of traffic flow are missing. Furthermore, traffic friction due to vehicle interactions at entrances/exits and weaving areas is almost not treated in the existing models. The main purpose of this project is to reduce the above flaws by developing advanced traffic flow models. Moreover, various numerical methods are investigated in this project. The organization of the report is as follows: Section I is an Introduction. The state-of-the-art review on the existing continuum modelling and the development of two new high-order formulations are given in Section II. The explicit numerical implementation of new high-order models is presented in Section III. Section IV presents the implicit numerical implementation of the new high-order models. Section V discusses the methodologies of modelling interrupted flows with entrance/exit ramps. Comprehensive testing using the data collected are performed and results and findings are summarized in Section VI. Section VII presents the comparison of numerical schemes for the simple continuum model. The final section, Section VIII, gives the conclusions from this project and discusses areas for future research.

  • Corporate Authors:

    University of Minnesota, Minneapolis

    Department of Civil and Mineral Engineering, 122 Civil and Mineral Engineering Building
    Minneapolis, MN  United States  55455-0220
  • Authors:
    • Lyrintzis, A
    • Michalopoulos, P
    • Chronopoulos, A
    • Yi, P
    • Liu, G
    • Rhee, C-Y
  • Publication Date: 1992-10-23


  • English

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: v.p.

Subject/Index Terms

Filing Info

  • Accession Number: 00628833
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 15 1993 12:00AM