; (B) the completion of outstanding statutory mandates required by MAP–21 (112–141) and the FAST Act (114–94); and (C) a Large Truck Crash Causal Factors Study of the Administration. 106. Definitions In this division, the following definitions apply: (1) Highway Account The term Highway Account means the portion of the Highway Trust Fund that is not the Mass Transit Account. (2) Mass Transit Account The term Mass Transit Account means the portion of the Highway Trust Fund established under section 9503(e)(1) of the Internal Revenue Code of 1986. (3) Secretary The term Secretary means the Secretary of Transportation. B Surface Transportation 1001. Applicability of division (a) Applicability This division, including the amendments made by this division, applies beginning on October 1, 2021. (b) Reference to date of enactment In this division and the amendments made by this division, any reference to— (1) the date of enactment of this Act; (2) the date of enactment of a provision of this division; (3) the date of enactment of a provision added to law by an amendment made by this division