Abstract – In this paper we describe FreeSim, which is a fully-customizable macroscopic and microscopic free-flow traffic simulator. FreeSim allows for multiple freeway systems to be easily represented and loaded into the simulator as a graph data structure with edge weights determined by the current speeds. Traffic and graph algorithms can be created and executed for the entire freeway system or for individual vehicles, and the traffic data used by the simulator can be user-generated or be converted from real-time data gathered by a transportation organization. The vehicles in FreeSim can communicate with the system monitoring the traffic on the freeways, which makes FreeSim ideal for ITS simulation. FreeSim is licensed under the GNU General Public License, and the source code is available for download fro
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