; (3) identify what data may be collected and analyzed using these technologies and how such data would be used to continue to address identified transportation challenges; and (4) comply with any other requirements that the Secretary may identify. (e) Non-Federal Share The non-Federal share of the cost of a project for which a grant is awarded under this section shall be a minimum of 25 percent of the total cost. (f) Amount of Grants The amount of a grant awarded under this section shall be a minimum of $20,000,000 and a maximum of $40,000,000. The total amount of funds awarded under this section shall not exceed $100,000,000 for one calendar year. (g) Authorization of Appropriations There is authorized to be appropriated to carry out this section $100,000,000 for each of fiscal years 2018 through 2022. Additionally, the Secretary may reallocate unobligated funds to carry out this section. 6. GAO study Not later than 1 year after the date of enactment of this Act, the Comptroller General of the United States shall conduct a study to identify— (1) financial and procurement mechanisms currently available to public and private entities to fund smart city or community activities and associated demonstration projects, including pay for performance financing that could deliver measurable and verifiable market and non-market values to smart cities or communities; (2) new, innovative financial and procurement mechanisms under development or used experimentally that may be available, in the near term, to public and private entities to fund smart city or community activities and associated demonstration projects; (3) barriers to creative financing solutions for those activities and projects, including procurement barriers faced by State and local governments