; and (ii) measures to reduce visibility impairments for bus operators that contribute to accidents, including retrofits to buses in revenue service and 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 individuals and objects into bus operators’ workstations when a recipient’s risk analysis determines that such barriers would reduce assaults 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) other measures 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 each recipient required to develop a program under paragraph (1) to— (A) update such program annually