Creation a Passing Gap-Acceptance Model for Egyptian Two-Lane Two-Way Roads

Passing is one of the most complex manoeuvres on the two-lane two-way (TLTW) roads, where the follower vehicles use the opposing lane to overtake the leader slower vehicles, especially with the presence of oncoming vehicles from the opposite direction. This paper presents the development of a new passing model for the Egyptian TLTW roads under mixed traffic conditions. The developed model is calibrated and validated using data from 6 TLTW roads, with about 20-hours of videotaped data, from the Delta region in Egypt. The results show that the new passing model is matching the observed passing maneuvers which confirms that the new passing model is a good representative for modeling passing maneuvers for the Egyptian TLTW roads under mixed conditions. The new model results are compared with previously developed international models, namely: the Tang’s and Ghods models. The results are based on Ghods’ gap-acceptance model matched observed overtakes by 76.45 % while Tang’s model was rejected due to the higher differences between their outputs and actual measures. Moreover, the new developed passing model for calculation of passing duration and corresponding distance was more representative than Ghods’ and Tang’s models for TLTW Egyptian roads.