; and (4) by adding after subsection (d) the following new subsections: (e) Technology Not later than September 30, 2023, the Secretary of Homeland Security, in carrying out this section, shall deploy along the United States border the most practical and effective technology available for achieving situational awareness and operational control of the border. (f) Limitation on requirements Nothing in this section may be construed as requiring the Secretary of Homeland Security to install tactical infrastructure, technology, and physical barriers in a particular location along an international border of the United States, if the Secretary determines that the use or placement of such resources is not the most appropriate means to achieve and maintain situational awareness and operational control over the international border at such location. (g) Definitions In this section: (1) High traffic areas The term high traffic areas means areas in the vicinity of the United States border that— (A) are within the responsibility of U.S. Customs and Border Protection; and (B) have significant unlawful cross-border activity, as determined by the Secretary of Homeland Security. (2) Operational control The term operational control has the meaning given such term in section 2(b) of the Secure Fence Act of 2006 ( 8 U.S.C. 1701 note; Public Law 109–367 ). (3) Physical barriers The term physical barriers includes reinforced fencing, border wall system, and levee walls. (4) Situational awareness The term situational awareness has the meaning given such term in section 1092(a)(7) of the National Defense Authorization Act for Fiscal Year 2017 ( 6 U.S.C. 223(a)(7)