the accident rate per vehicle-mile of increasing the flow of traffic in a given roadway" (Vickrey, 1969).
             Construction to Ease Bottlenecks explains the bottleneck congestion with the aid of an example of 7,200 commuters who pass the same narrow passage during the same time of day. Vickrey discusses the road capacity in terms of current capacity, potentially smaller and potentially larger capacity. A major factor to be c
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