To extend the Intermodal Surface Transportation Efficiency Act of 1991 through March 31, 1998.

[AI summary unavailable — showing source text] Amends the Intermodal Surface Transportation Efficiency Act of 1991 (ISTEA) to authorize appropriations for October 1, 1997, through March 31, 1998, for specified Federal-aid highways, highway safety construction, highway safety, Federal transit, motor carrier safety, and transportation research programs. Mandates apportionment of such funds among the States according to FY 1997 ISTEA final funding percentages, and distribution to each State according to existing ISTEA categories in the same proportion as FY 1997. Specifies general operating expenses and certain deductions for: (1) territorial highways; (2) the National Recreation Trails program; (3) the Woodrow Wilson Bridge; (4) off-system bridges; (5) Federal lands highways; (6) the highway use tax evasion investigation and enforcement program; (7) the scenic byways program; and (8) ferry boat construction. Limits FY 1998 obligations to 50 percent on October 1, 1997, and 50 percent on July 1, 1998. Directs the Secretary of Transportation, in applying certain Buy American requirements to buses purchased with funds under this Act, to require that the final assembly of such buses be conducted in the United States, including, at a m…