amounts Each direct recipient shall receive not less than $10,000,000 and not more than $50,000,000 each fiscal year. (C) Minimum guaranteed amount In making a determination whether to designate a metropolitan planning organization as a direct recipient under subsection (b), the Secretary shall ensure that each direct recipient receives the minimum required allocation under subparagraph (B). (D) Additional amounts If any amounts remain unallocated after the distribution described in this subsection, such remaining amounts and an associated amount of obligation limitation shall be made available for the purposes described in clauses (i) and (ii) of section 133(d)(1)(A) of title 23, United States Code, and distributed among the States in proportion to the relative shares of the population (as determined by data collected by the Bureau of the Census) of the urbanized areas of each State bears to the total population of all urbanized areas across all States. (4) Assumption of responsibility of the Secretary (A) In general For projects carried out with funds provided under this section, the direct recipient may assume the responsibilities of the Secretary under title 23, United States Code, for design, plans, specifications, estimates, contract awards, and inspections with respect to the projects unless the Secretary determines that the assumption is not appropriate. (B) Agreement The Secretary and the direct recipient shall enter into an agreement relating to the extent to which the direct recipient assumes the responsibilities of the Secretary under this paragraph. (C) Limitations The Secretary shall retain responsibilities described in subparagraph (A) for any project that the Secretary determines to be in a high-risk category, including projects on the National Highway System. (e) Expenditure of funds (1) Consistency with metropolitan planning Except as otherwise provided in this section, programming and expenditure of funds for projects under this section shall be consistent with the requirements of section 134