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The Intermodal Surface Transportation Efficiency Act of 1991 (ISTEA) included a $24 billion, 6-year authorization that created a new federal-aid highway program--the surface transportation program. This program included a HIV/AIDS requirement that states set aside at least 10 percent of the $24 billion exclusively for 10 categories of "transportation enhancements," such as pedestrian walkways, bikeways, scenic easements, or historic preservation projects. Such enhancements are designed to strengthen the cultural, aesthetic, or environmental aspects of transportation or to encourage greater use of nonmotorized transportation.