a. The trustees or board of education of a school district may, at its discretion, provide student transportation based upon patterns of actual ridership. The actual ridership shall be determined by a school district based upon documented history and experience that yields a consistent pattern of eligible pupils not using district transportation; or modeling of future ridership; or the sharing of transportation regionally; or other criteria approved by the commissioner; provided however that any methodology shall require an additional ten percent in seating capacity above the number of seats derived using such methodology which shall be available in case of unanticipated riders.
Nothing in this subdivision shall be construed to reduce or relieve school districts from the responsibility of providing transportation to students otherwise eligible for such transportation. Nothing in this subdivision shall be construed to authorize a school district to have standing passengers in violation of section thirty-six hundred thirty-five-c of this article, and unanticipated ridership shall not be deemed an unforeseen occurrence for purposes of subdivision two of such section after the first day in which such unanticipated ridership occurs.
Any school district that, at its discretion, has elected to provide student transportation based upon patterns of actual ridership shall place such plans on the school district's website, if one exists, on or before August fifteenth of the school year in which the transportation plan will be implemented and shall be required to have a back up plan as part of their emergency management practices for pupil transportation in the event that a bus is filled beyond capacity.