One of the major transportation issues addressed in recent years has been the growing concern about transportation infrastructure not being able to keep pace with development. This imbalance between transportation supply and demand has resulted in increased congestion, delay and safety hazards at many locations throughout the United States. As a result, traffic impact studies are becoming more popular as a planning tool so that the traffic impacts of new developments can be foreseen and effective mitigating measures can be taken using optimal allocation of available funds. The passage of the new Clean Air Act and the Intermodal Surface Transportation Efficiency Act calls for more cooperation between developers and transportation professionals to move new transportation projects from design to implementation. In response to this need for cooperation between different levels of governments, developers and transportation professionals, the authors have developed a set of procedures within which a traffic impact study can be formulated.1,2 At the heart of these procedures is the determination of the scope of a traffic impact study for a proposed site. Using the concept of “warrant s, ” a flexible method of determining the necessary elements in a particular traffic impact analysis have been established. In this way, unnecessary analyses and delays can be avoided, while ensuring that all the required issues have been addressed
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