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‘‘(IV) scale houses;
‘‘(ix) improvements directly relating to
securing transportation infrastructures for
detection, preparedness, response, and recov-
ery;
‘‘(x) operating costs relating to traffic
monitoring, management, and control;
‘‘(xi) operational improvements; and
‘‘(xii) transportation system manage-
ment and operations.
‘‘(4) COUNTY.—The term ‘county’ includes—
‘‘(A) a corresponding unit of government
under any other name in a State that does not
have county organizations; and
‘‘(B) in those States in which the county
government does not have jurisdiction over high-
ways, any local government unit vested with ju-
risdiction over local highways.
‘‘(5) FEDERAL-AID HIGHWAY.—
‘‘(A) IN GENERAL.—The term ‘Federal-aid
highway’ means a highway eligible for assistance
under this chapter.
‘‘(B) EXCLUSIONS.—The term ‘Federal-aid
highway’ does not include a highway classified
as a local road or rural minor collector.
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‘‘(6) FEDERAL-AID SYSTEM.—The term ‘Federal-
aid system’ means any of the Federal-aid highway
systems described in section 103.
‘‘(7) FEDERAL
LANDS
HIGHWAY.—The term
‘Federal lands highway’ means—
‘‘(A) a forest highway;
‘‘(B) a recreation road;
‘‘(C) a public Forest Service road;
‘‘(D) a park road;
‘‘(E) a parkway;
‘‘(F) a refuge road;
‘‘(G) an Indian reservation road; and
‘‘(H) a public lands highway.
‘‘(8) FOREST HIGHWAY.—The term ‘forest high-
way’ means a forest road that is—
‘‘(A) under the jurisdiction of, and main-
tained by, a public authority; and
‘‘(B) is open to public travel.
‘‘(9) FOREST ROAD OR TRAIL.—
‘‘(A) IN GENERAL.—The term ‘forest road or
trail’ means a road or trail wholly or partly
within, or adjacent to, and serving National
Forest System land that is necessary for the pro-
tection, administration, use, and development of
the resources of that land.
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‘‘(B) INCLUSIONS.—The term ‘forest road or
trail’ includes—
‘‘(i) a classified forest road;
‘‘(ii) an unclassified forest road;
‘‘(iii) a temporary forest road; and
‘‘(iv) a public forest service road.
‘‘(10) FREIGHT TRANSPORTATION GATEWAY.—
‘‘(A) IN GENERAL.—The term ‘freight trans-
portation gateway’ means a nationally or re-
gionally significant transportation port of entry
or hub for domestic and global trade or military
mobilization.
‘‘(B) INCLUSIONS.—The term ‘freight trans-
portation gateway’ includes freight intermodal
and Strategic Highway Network connections that
provide access to and from a port or hub de-
scribed in subparagraph (A).
‘‘(11) 
HIGHWAY.—The 
term 
‘highway’
includes—
‘‘(A) a road, street, and parkway;
‘‘(B) a right-of-way, bridge, railroad-high-
way crossing, tunnel, drainage structure, sign,
guardrail, and protective structure, in connec-
tion with a highway; and
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‘‘(C) a portion of any interstate or inter-
national bridge or tunnel (including the ap-
proaches to the interstate or international bridge
or tunnel, and such transportation facilities as
may be required by the United States Customs
Service and the Bureau of Citizenship and Im-
migration Services in connection with the oper-
ation of an international bridge or tunnel), the
cost of which is assumed by a State transpor-
tation department.
‘‘(12) 
HIGHWAY
SAFETY
IMPROVEMENT
PROJECT.—The term ‘highway safety improvement
project’ means a project that meets the requirements
of section 148.
‘‘(13) INDIAN RESERVATION ROAD.—
‘‘(A) IN GENERAL.—The term ‘Indian res-
ervation road’ means a public road that is lo-
cated within or provides access to an area de-
scribed in subparagraph (B) on which or in
which reside Indians or Alaskan Natives that, as
determined by the Secretary of the Interior, are
eligible for services generally available to Indians
under Federal laws specifically applicable to In-
dians.
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‘‘(B) AREAS.—The areas referred to in sub-
paragraph (A) are—
‘‘(i) an Indian reservation;
‘‘(ii) Indian trust land or restricted
Indian land that is not subject to fee title
alienation without the approval of the Fed-
eral Government; and
‘‘(iii) an Indian or Alaska Native vil-
lage, group, or community.
‘‘(14) INTERSTATE
SYSTEM.—The term ‘Inter-
state System’ means the Dwight D. Eisenhower Na-
tional System of Interstate and Defense Highways de-
scribed in section 103(c).
‘‘(15) MAINTENANCE.—
‘‘(A) IN GENERAL.—The term ‘maintenance’
means the preservation of a highway.
‘‘(B) INCLUSIONS.—The term ‘maintenance’
includes the preservation of—
‘‘(i) the surface, shoulders, roadsides,
and structures of a highway; and
‘‘(ii) such traffic-control devices as are
necessary for safe, secure, and efficient use
of a highway.
‘‘(16) MAINTENANCE AREA.—The term ‘mainte-
nance area’ means an area that was designated as a