Providing adequate roadway capacity, particularly in high-volume conditions, is an essential component of mobility, safety, and the stewardship of public funds for transportation. In urban areas, interchange spacing and the adequacy of design for weaving, merge, and diverge areas can significantly impact the available capacity. Traffic microsimulation tools such as VISSIM allow detailed analyses of these critical areas in complex locations. In order to obtain valid results, however, various inputs must be calibrated to local conditions. The resulting calibration factors can enable a higher level of fidelity in modeling traffic behavior and help balance need with investment. Two crucial inputs to calibrate VISSIM are standstill distance and headway. Standstill distance, the distance between stopped vehicles, indicates the maximum traffic density on a roadway section, in that vehicles are as close together as possible. Headway, the elapsed time between the front bumper of the leading vehicle and the front bumper of the following vehicle, indicates the capacity of a roadway section; when all vehicles are at their headway, any additional traffic density causes vehicles to begin braking, which in turn causes congestion. Time gap is similar but is defined as the elapsed time between the back bumper of the leading vehicle and the front bumper of the following vehicle.


    Access

    Access via TIB

    Check availability in my library


    Export, share and cite



    Title :

    VISSIM Calibration for Urban Freeways. Tech Transfer Summary


    Contributors:
    J. Dong (author) / A. Houchin (author) / N. Shafieirad (author) / C. Lu (author) / N. Hawkins (author) / S. Knickerbocker (author)

    Publication date :

    2015


    Size :

    3 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




    VISSIM Calibration for Urban Freeways

    J. Dong / A. Houchin / N. Shafieirad et al. | NTIS | 2015


    Parameters Influencing Lane Flow Distribution on Multilane Freeways in PTV Vissim

    Weyland, Claude / Baumann, Marvin V. / Buck, H. Sebastian et al. | DataCite | 2021

    Free access



    CALIBRATION OF AUTONOMOUS VEHICLES IN PTV VISSIM

    Gazder, U. / Alhalabi, K. / AlAzzawi, O. | TIBKAT | 2021