The objectives of project R47 are to investigate the feasibility of utilising emerging data sources for excessive congestion cost estimation and also to review and identify alternative methods for defining thresholds for measuring excessive delay for arterial roads. Following the methodology used in project R22 (provide the title here), excessive congestion cost is defined in this report as the sum of excessive delay cost and travel time reliability cost. The excessive travel delay is estimated by comparing prevailing travel times/speeds with reference travel times/ speeds. The travel time reliability (i.e. buffer time) is represented by the difference between the 95th percentile travel time and the 50th percentile travel time. In theory, travel time reliability only applies to the route level and should reflect the day-by-day variations. Two case studies, namely congestion analysis of Bruce Highway and Gympie Road comprise project R47.
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