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From page 1...
... The examples show that some of these "simpler" approaches have grown more sophisticated as geographic information system databases are used to assess demographic characteristics and identify similar routes, and as APCs and ongoing programs improve the accuracy of ridership data. More formal methods, including use of the fourstep travel model, are used when either the change or the time frame is beyond the scope of the current system.
From page 2...
... Examples cited throughout this synthesis demonstrate that qualitative procedures can involve consideration of a wide variety of factors, often directed toward identifying similar circumstances elsewhere in the transit system that can provide guidance for likely ridership response. • Use of service and headway elasticities is widespread among transit agencies.

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