Although these general trends have been noted, the precise funding needs of public and specialized transportation remain unknown. While expenses, service levels, and ridership of existing transit operations have been documented to some extent, potential ridership has not been quantified. The acceptability of public transportation to the presently unserved public is unknown, as is individuals and localities ability to pay for transportation services. The economic and administrative impact of the federal Americans with Disabilities Act has likewise not been estimated. Without this information, it has been impossible for executive and legislative branches of state government to ascertain whether state subsidization of public and specialized transportation is warranted.