; and (B) construction and operational improvements. (2) Limitations (A) In general An eligible entity may use not more than 25 percent of the amount of a grant under this section for activities described in paragraph (1)(A). (B) Existing facilities (i) In general Except as provided in clause (ii), not more than 10 percent of the amounts made available for each fiscal year for grants under this section may be used for projects described in subsection (d)(2)(E) that solely identify, promote, and manage the availability of existing commercial motor vehicle parking. (ii) Exception Clause (i) shall not apply to a project described in subsection (d)(2)(E) that is part of a project to expand commercial motor vehicle parking capacity. (3) Prohibition (A) In general Amounts made available to carry out this section shall not be used for the construction, or development phase activities that would enable the construction, of charging or fueling infrastructure for the propulsion of a vehicle, including a commercial motor vehicle. (B) Savings provision Nothing in this paragraph limits the use of funds other than funds made available to carry out this section. (i) Requirements (1) Publicly accessible parking Commercial motor vehicle parking constructed, opened, or improved with funds from a grant under this section shall be open and accessible to all commercial motor vehicle drivers. (2) Prohibition on charging fees (A) In general No fee may be charged by an eligible entity to a commercial motor vehicle driver to gain access to parking constructed, opened, maintained, or improved with a grant under this section. (j) Treatment of projects Notwithstanding any other provision of law, a project carried out under this section shall be treated as a project on a Federal-aid highway under this chapter. (k) Period of availability of funds Amounts made available for projects under this section shall remain available for a period of 3 years after the last day of the fiscal year in which the amounts are made available. . (b) Clerical