Traffic Condition Improvement using Aimsun Simulation Software

In this paper, the 1st Shahran square that is located in the North West of Tehran metropolis, was simulated and analyzed with Aimsun simulation software based on microscopic level. Field study data were obtained from census of cars and buses passing through each side of the square and around it in peak hour traffic (from 5 pm to 6 pm). In addition, the percentage of the route choice was specified to determine traffic conditions. After collecting and entering data in Aimsun, calibrating values based on observed drivers’ behavior were entered to achieve validation and verification of the input data. For this purpose, two main scenarios were examined. In the first scenario, the current situation of the square with just one U-turn on the east side of the square was evaluated. Then, as a traffic solution in the second scenario, three U-Turns were designed on the west side, north side, and south side of the square. The output results from comparison two scenarios showed a downward trend in travel time and number of stops, while, speed rate and traffic flow rate showed an upward trend.