The gap acceptance behavior to the opposing through traffic of "permitted" right-turn vehicles is one of the important events for evaluating the safety of signalized intersections. In this study, a decision-making process of gap acceptance was carefully investigated through paying attention to a difference by the number of opposing approach lanes. Moreover, a gap acceptance model of permitted right-turn vehicles at the multilane signalized intersection was developed considering arriving

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... ' positions in the multiple opposing approach lanes by using binomial logit model. The model estimation result quantitatively showed that the gap acceptance decision is being influenced not only by gap times and arrival through vehicle speeds but also by their driving positions at the intersection approach lane. Furthermore, the calculation result of the critical gap time suggested that it varies depending on the positions of opposing through vehicles in the multilane intersection comparing to the case of single opposing lane intersection.