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This paper describes the application of human factors research tools to the design of Intelligent Transportation Systems (ITS). A key issue in the conduct of human factors research for ITS is to select a research tool that provides the desired design information at the lowest technical risk and lowest cost. Below, we describe three studies that addressed human performance issues associated with ITS, each using tools that were selected on the basis of explicit research objectives. Using the appropriate research tools will allow the human factors professional to meet the needs of ITS designers and developers and, most important of all, the drivers who will benefit from these systems.