; and (ii) measures to reduce visibility impairments for bus operators that contribute to accidents, including— (I) retrofits to buses in revenue service; and (II) specifications for future procurements that reduce visibility impairments; (B) bus operator assault mitigation, including— (i) the deployment of assault mitigation infrastructure and technology on buses, including barriers to restrict the unwanted entry of an individual or object into the workstation of a bus operator if the risk analysis conducted by the recipient under paragraph (2) determines that such a barrier would reduce assaults on and injuries to bus operators; and (ii) conflict de-escalation training for bus operators; (C) installation of seating and modification to design specifications of bus operator workstations that reduce or prevent injuries from ergonomic risks; and (D) any other measure that the Secretary determines would significantly reduce the number and rate of accidents, injuries, assaults on bus operators, and fatalities related to bus operations. (4) Updating requirements The Secretary shall require a recipient required to develop a covered program to— (A) update the program annually; and (B) resubmit the program for approval by the Secretary not less frequently than once every 3 years. . (b) FAST Act Section 3022 of the Fixing America's Surface Transportation Act ( 49 U.S.C. 5329 note; Public Law 114–94 ) is amended— (1) by redesignating subsection (c) as subsection (d)