A Major Investment Study was required under the Intermodal Surface Transportation Efficiency Act (ISTEA) of 1991. However, the Transportation Equity Act for the 21st Century repealed this requirement in 1998. The MIS is intended to consider in detail a greater range of multiple transportation alternatives and their potential impacts than required in the preparation of an EIS. During a MIS, early attention is provided to public involvement, intergovernmental cooperation, and evaluation of potential community and ecological impacts. Typically in a MIS, designation of particular routes comes late in the study. This structure is intended to provide the maximum flexibility and objectivity in evaluating a potential major public investment.