Park, Minchul (2005-12). The effect of weaving maneuvers on operation of a free right-turn lane at ramp terminals. Master's Thesis. Thesis uri icon


  • Service interchange ramp terminals provide access from the local highway or urban
    street system to the freeway. In urban areas, the ramp terminals at the arterial road are
    usually signalized for separation of all high-volume conflicting movements. If right-turn
    or other movements exiting from the ramp terminals are high, a free right-turn lane,
    which improves operations for right-turn and through exiting traffic, is sometimes
    provided at the ramp terminals with an exclusive lane for right-turn vehicles on a
    departure leg.
    If the ramp terminal is closely followed by the next downstream intersection,
    weaving maneuvers will occur since some vehicles make a right turn at the ramp
    terminal and make a left turn at the downstream intersection. These weaving vehicles
    usually slow down or stop on the free right-turn lane in order to find an acceptable gap in
    the arterial road traffic. These slowing or stopping vehicles may cause safety and
    operational problems. This research evaluates the effect of these weaving maneuvers on
    the operations of a free right-turn lane at the ramp terminals. To provide a means for evaluating free right-turn lane operations, a linear
    regression model was developed to predict the delay on the free right-turn lane caused
    by stopped or slowed vehicles planning on making a weaving maneuver. The variables
    for this model were arterial through volumes, weaving volumes, number of lanes, and
    ramp spacing within the interchange. The regression model was based upon the results
    of the CORSIM traffic simulation model that was calibrated using field data obtained
    from the study site in College Station, Texas.
    Once the predicted model was developed, the model validation was performed
    using the field data to check the accuracy of its prediction. A statistical measure was
    performed for quantifying the difference between the observed and predicted delay on
    the free right turn lane. From the research results, it was concluded that the weaving
    maneuvers influence the operation of a free right-turn lane and cause delay on the free
    right-turn lane.

publication date

  • December 2005