Map World Forum Hyderabad, India Studying the effect of traffic elements by GIS

Today, there are a number of techniques like simulations which are used to study how various elements affect the speed of cars in urban streets. Gathering the data required to feed such techniques is a costly and time consuming process. In this paper a new method, so called "The adjustment " is presented which uses only the total travel times and volumes in streets to estimate the effect of all traffic elements on a car's speed. This technique considers a buffer around any given traffic element and estimates the value of the elements such that the total travel times and volumes are fulfilled. The technique proposed was tested in many Tehran streets using available traffic data. The elements used were bus stops, pedestrian paths, and decelerators. The results suggested that the presented method requires much less data, though giving similar accuracy compared with the traditional techniques. In addition, this method can be used to anticipate the speed using GIS taking into account the parameters studied