Section,
Pub. L. 92–434, § 6, Sept. 26, 1972,
86 Stat. 732, directed that tolls charged for use of an international bridge constructed or acquired under this subchapter by private individual, company, or other private entity be collected for a reasonable period for amortization of construction or acquisition costs, plus interest and reasonable return, that at end of such period the United States portion of bridge become the property of the State having jurisdiction over such United States portion, and that accurate records on expenditures and tolls collected be kept and annually reported to Secretary of Transportation, with authority for Secretary to conduct audits.