This guidebook describes the use of a procedure for evaluating the safety of alternative intersection configurations and traffic control types. It includes guidance for conducting the evaluation and guidance for the use of the Intersection Safety Analysis Tool (InSAT). This tool can be used to automate the calculations associated with the evaluation and is available on the TRB website (www.trb.org). The equations used in InSAT are implemented in a Microsoft® Excel™ workbook as software (using the Visual Basic for Applications programming language). The user manual consists of three main chapters and four appendices. The first chapter provides an introduction to InSAT and describes the typical steps involved in using the InSAT software. The second chapter describes the information needed for an InSAT evaluation. It also reviews the performance measures predicted by InSAT. The third chapter provides guidance for evaluating intersection safety using InSAT. The appendices provide local-calibration information, a sample application, and case-study applications of the engineering study process. (Author/publisher).
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