for the Metropolitan Transit Authority of Harris County, Texas if the proposed capital project is constructed on or planned to be constructed on Richmond Avenue west of South Shepherd Drive or on Post Oak Boulevard north of Richmond Avenue in Houston, Texas. (b) The Metropolitan Transit Authority of Harris County, Texas, may attempt to construct or construct a new fixed guideway capital project, including light rail, in the locations referred to in subsection (a) if— (1) voters in the jurisdiction that includes such locations approve a ballot proposition that specifies routes on Richmond Avenue west of South Shepherd Drive or on Post Oak Boulevard north of Richmond Avenue in Houston, Texas