; and (bb) not more than 10 miles per hour below the speed limit, in the case of a toll facility with a speed limit of less than 50 miles per hour. (v) Maintenance of operating performance (I) In general Not later than 180 days after the date on which a facility or a corridor or cordon becomes degraded under clause (iv), the public authority with jurisdiction over the facility shall submit to the Secretary for approval a plan that details the actions the public authority will take to make significant progress toward bringing the facility or corridor or cordon into compliance with this subparagraph. (II) Notice of approval or disapproval Not later than 60 days after the date of receipt of a plan under subclause (I), the Secretary shall provide to the public authority a written notice indicating whether the Secretary has approved or disapproved the plan based on a determination of whether the implementation of the plan will make significant progress toward bringing the facility or corridor or cordon into compliance with this subparagraph. (III) Update Until the date on which the Secretary determines that the public authority has brought facility or corridor or cordon into compliance with this subparagraph, the public authority shall submit annual updates that describe— (aa) the actions taken to bring the facility into compliance; (bb) the actions taken to bring the corridor or cordon into compliance