Vehicles are color coded by lane of origin so that passing can be better observed.
When developing this simulator, we referenced that found in the web site of http://www.traffic.uni-duisburg.de/head.html. The program posted on the same site was used for the flow simulation of the two-lane case. Further, the scrollbars and buttons to select options are used directly from their code. Our model additionally provides 1, 2, 3, and 4 lane operations with nearly symmetric lane changing feature (with a slight preference for left lane changes) on a stretch of roadway, i.e., an open system, rather than a closed system on a circular roadway (which is the case of the Uni Duisburg simulator).