Cost-Effective Performance Measures for Travel Time Delay, Variation, and Reliability (2008) / Chapter Skim
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Pages 37-40
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From page 37... ...
The chapter starts by reiterating the key considerations involved in defining agency performance standards and collecting data for the purpose of deficiency assessments. Readers are referred to the appropriate chapter for additional background information and guidance on selection of performance measures, setting of performance standards, data collection, and forecasting of travel time and delay.
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From page 38... ...
If the situation and analytical framework call for consideration of nonrecurring delay in the identification of deficiencies and testing of solutions, these measurements should be left in the data computations, and the appropriate performance measures used in the analysis. 5.4.1 Taking Luck Into Account In Field Measurements Once the standards have been set and the performance data have been gathered, the next task is to determine if one or more of the performance standards have been violated.
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From page 39... ...
5.5 Comparing Forecasted Performance to Performance Standards Generally the degree of uncertainty present in forecasts or estimates of travel time or delay in not known. Common practice is to completely ignore any uncertainty in the x q t s n n> − ⋅− −( )
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From page 40... ...
(There may be excessive variability in travel time, but delay recurs regularly.) Inadequate capacity when compared to demand.
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