Knowledge of fundamental traffic flow characteristics and vehicle dynamic behavior are essential for operation of transportation system. The fundamental characteristics of speed and flow have been studied. Time-headway distribution of urban heterogeneous traffic was also studied. An appropriate methodology was adopted to collect and extract headway data. The methodology for choice of best fitting statistical distribution to the observed headway data has also been described. The result of the study has shown that, the headways of urban heterogeneous traffic can be modelled for vehicles over a wide range of traffic flow levels. Speed-flow curves for a selected road facility were plotted.
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