Development and evaluation of a microscopic overtaking gap acceptance model for two-lane highways

摘要

A microscopic gap acceptance model is presented that simulates overtaking behavior on two-lane highways. The decision to initiate overtaking is expressed as a function of each driver's perception of the expected time-to-collision (TTC) with the nearest opposing vehicle at the end of maneuver. The available gap is accepted if the driver's perception of TTC exceeds a predetermined threshold for safe return (critical TTC). The gap acceptance model is calibrated and validated based on overtaking video-recording data for a two-lane highway. The overtaking gap acceptance model is then compared, for consistency and transferability, with independent aggregate field data, as well as with two other simulation models and values given in the Highway Capacity Manual for similar two-lane highways. The gap acceptance simulation demonstrated that the proposed overtaking model is able to provide reliable measures of traffic attributes for two-lane highway operation, as verified experimentally.