Many first-order macroscopic models for freeway traffic have been developed since the seminal work on the well-known Lighthill–Whitham–Richards, or LWR, continuous model. The asymmetric cell transmission model (ACTM) is a widely accepted macroscopic model integrated into a variety of freeway traffic control frameworks. The model is based on the original cell transmission model; modified merge equations make it computationally tractable for optimization of ramp metering. However, when the common simplistic calibration of the model is used, an infeasible merging behavior is observed at uncontrolled merges, and the resulting queue lengths are not accurately estimated. This paper proposes an elegant analytical relationship, based on traffic flow theory, for calibrating the two parameters involved in the ACTM merge model. The method ensures the physical consistency of the dynamics involved in queue processes in the proximity of a noncontrolled merge junction. This method should be an essential feature of any freeway traffic model.


    Access

    Download

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    On the Consistency of Freeway Macroscopic Merging Models


    Additional title:

    Transportation Research Record: Journal of the Transportation Research Board


    Contributors:


    Publication date :

    2014-01-01




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English



    Gap stability and freeway merging

    Klee, H. | Tema Archive | 1981



    Temporal Stability of Freeway Macroscopic Traffic Stream Models

    Liu, Chenhao / Williams, Billy M. / Rouphail, Nagui M. | Transportation Research Record | 2012



    Comparison of macroscopic models for control of freeway traffic

    Papageorgiou, Markos / Posch, Bernd / Schmidt, Guenther | Elsevier | 1981