Project R22 aims to produce a methodology for estimating excessive congestion costs associated with multiple road users that include: passenger cars, heavy vehicles (HVs) and buses. The first-year report of Project R22 proposed a framework that considered excessive travel delay by comparing prevailing travel times (or speeds) with reference travel times (or reference speeds) and also took into consideration the reliability cost of travel time. Two case studies, one for bus congestion delay cost estimation and one for freeway before-and-after congestion cost comparison, were also conducted to test the methodology.
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