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<p>Traffic Congestion interferes with the operations of bus service and imposes additional costs to the transit agency that provides the service. As traffic volumes or congestion increase, traffic speeds decrease, as established in traffic engineering formulas and curves that show speed as a function of the traffic volume to capacity ratio. This results in additional time being required to travel a fixed distance. Congestion also decreases bus speeds and increases the travel time for buses. The basic approach of this study involved developing a regression model that estimates bus travel time rate (in minutes per mile) as a function of the travel time rate for traffic.</p>