Analytical Procedures for Determining the Impacts of Reliability Mitigation Strategies (2012) / Chapter Skim
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Pages 217-220
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217 A p p e n d i x C As a bystander, it is fairly easy to watch traffic flow around the location of an incident and identify the delay associated with that incident as the queue that forms at that location. As long as that queue remains in place, even if it moves up- or downstream as a result of shock waves and other physical phenomena, all the delay can be associated with the observed incident.
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218 Figure C.1. Extra congestion caused by release of traffic delayed behind a major accident scene on westbound I-90.
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219 The other difficulty with associating incidents and specific trips is understanding the duration of the congestion that forms as a result of that incident. In the above example, the queue formed (or disruption caused)
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220 incident's congestion-causing influence, it is difficult to separate out the lasting influence of the incident on bottleneck formation, even when detailed statistics are available. Queuing extended influence is thus assumed to be a reasonable liberal measure of the effects of incidents on the travel times experienced by motorists.
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