https://khsaa.org/running-clock-provisions-khsaa-football-all-high-school-levels-of-play/
RUNNING CLOCK PROVISIONS
This point differential applies to all football contests. The National Federation’s Football Rules Committee has a provision in the playing rules which permit state associations to adopt a “running clock” when a point differential is attained. This provision is in place for all football playing schools for all levels in Kentucky:
Any time the score differential reaches thirty-six (36) points or more, the following changes will be made regarding rules determining when the clock will be stopped and/or started. In addition, in keeping with the rules that allow for mutual agreement between coaches for period shortening, the running clock may be implemented at any time by mutual agreement of the coaches. Coaches choice may not supersede the automatic provisions with a 36-point differential.
1. Once the running clock provisions are implemented, the clock shall continue to run from the point that the differential occurs (without regard to a later return to less than the differential) with the following clarifications: