; construction. Sec. 809. Miscellaneous technical corrections. 2. Definitions In this Act: (1) Northern border The term northern border means the international border between the United States and Canada. (2) Southern border The term southern border means the international border between the United States and Mexico. I Border Security 101. Definitions In this title: (1) Appropriate congressional committee The term appropriate congressional committee has the meaning given the term in section 2(2) of the Homeland Security Act of 2002 ( 6 U.S.C. 101(2) ). (2) Commissioner The term Commissioner means the Commissioner of U.S. Customs and Border Protection. (3) High traffic areas The term high traffic areas has the meaning given that term in section 102(e)(1) of the Illegal Immigration Reform and Immigrant Responsibility Act of 1996, as amended by section 102 of this Act. (4) Situational awareness The term situational awareness has the meaning given that term in section 1092(a)(7) of the National Defense Authorization Act for Fiscal Year 2017 ( Public Law 114–328 ; 6 U.S.C. 223(a)(7) ). A Infrastructure and equipment 102. Strengthening the requirements for barriers along the southern border Section 102 of the Illegal Immigration Reform and Immigrant Responsibility Act of 1996 (division C of Public Law 104–208 ; 8 U.S.C. 1103 note) is amended— (1) by amending subsection (a) to read as follows: (a) In general The Secretary of Homeland Security shall take such actions as may be necessary (including the removal of obstacles to the detection of illegal entrants) to construct, install, deploy, operate, and maintain tactical infrastructure and border technology in the vicinity of the United States border to deter, impede, and detect illegal activity in high traffic areas. ; (2) in subsection (b)— (A) in the subsection heading, by striking fencing and inserting physical barriers ; (B) in paragraph (1)— (i) in subparagraph (A), by inserting situational awareness and before operational control