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The general acceptance of vehicle movements at unsignalized intersections is that vehicles in the major stream have absolute priority. However, under real traffic conditions this may not always be possible. Studies show that drivers waiting on the minor road approach can exhibit irregular behaviors when entering the intersection. In this case the drivers on the main road will try to prevent a possible accident by stopping or slowing down. This is referred to as "reverse priority" or "gap forcing " which causes delays in vehicles in the major stream. In the study, the conditions which causes delay to vehicles in the mainstream is investigated by using AIMSUN simulation program and new functions for stop-controlled, yield-controlled and uncontrolled intersections which can be used in calculation major stream delays are suggested. [ABSTRACT FROM AUTHOR]

In this study, the variation in the proportion of free vehicles at a signalized arterial is tried to be modeled with respect to distance and green/cycle time ratio. In the analysis, it is assumed that headways between vehicles can be defined with Cowan M3 distribution. From the analysis, proportion of free vehicles in the left lane of an arterial is lower than other lanes. This results indicates that, left lanes are occupied by higher vehicle volumes. The analysis also showed that, proportion free vehicles increase with respect to the distance to traffic signals as expected. [ABSTRACT FROM AUTHOR]