; and port infrastructure investments (including inland port infrastructure and land ports of entry): Provided further , That the Secretary may use up to 20 percent of the funds made available under this heading for the purpose of paying the subsidy and administrative costs of projects eligible for Federal credit assistance under chapter 6 of title 23, United States Code, if the Secretary finds that such use of the funds would advance the purposes of this paragraph: Provided further , That in distributing funds provided under this heading, the Secretary shall take such measures so as to ensure an equitable geographic distribution of funds and the investment in a variety of transportation modes: Provided further , That a grant funded under this heading shall be not less than $5,000,000 and not greater than $25,000,000: Provided further , That not more than 10 percent of the funds made available under this heading may be awarded to projects in a single State: Provided further , That the Federal share of the costs for which an expenditure is made under this heading shall be, at the option of the recipient, up to 80 percent: Provided further , That the Secretary shall give priority to projects that require a contribution of Federal funds in order to complete an overall financing package: Provided further , That of the funds made available under this heading $250,000,000 shall be for projects located in a rural area with a population of less than 200,000: Provided further , That for projects located in a rural area, the minimum grant size shall be $1,000,000 and the Secretary may increase the Federal share of costs above 80 percent: Provided further , That of the funds made available under this heading $250,000,000 shall be for projects that are within the boundaries of seaport facilities and intermodal connectors serving those facilities: Provided further , That of the funds made available under this heading $250,000,000 shall be for projects located in an urbanized area with a population of more than 200,000: