; and (C) consider how objective ranges in performance standards could be used to test motor vehicle safety standards, which safety standards would be appropriate for such testing, and whether additional authority would facilitate such testing. (2) Inclusion of priorities (A) Priorities The plan required by paragraph (1) shall detail the overall priorities of the National Highway Traffic Safety Administration for the 5 years following the issuance of the plan, including both priorities with respect to highly automated vehicles and priorities with respect to other safety initiatives of the Administration, in order to meet the Nation’s motor vehicle safety challenges. (B) Identification of elements that may require standards For highly automated vehicles, the National Highway Traffic Safety Administration should identify elements that may require performance standards including human machine interface and sensors and actuators, and consider process and procedure standards for software and cybersecurity as necessary. (3) Periodic updating The plan required by paragraph (1) shall be updated every 2 years, or more frequently if the Secretary considers it necessary. (d) Rulemaking proceedings on updated or new motor vehicle safety standards (1) In general Not later than 18 months after the date of enactment of this section, the Secretary shall initiate the first rulemaking proceeding in accordance with the rulemaking and safety priority plan required by subsection (c). (2) Prioritization of subsequent proceedings The Secretary shall continue initiating rulemaking proceedings in accordance with such plan. The Secretary may change at any time those priorities to address matters the Secretary considers of greater priority. If the Secretary makes such a change, the Secretary shall complete an interim update of the priority plan, make such update available to the public, and submit such update to the Committee on Energy and Commerce of the House of Representatives and the Committee on Commerce, Science, and Transportation