base apportionment
(h) Base Apportionment Defined .— In this section, the term “base apportionment” means the combined amount authorized for appropriation for the national highway performance program under section 119, the surface transportation block grant program under section 133, the highway safety improvement program under section 148, the congestion mitigation and air quality improvement program under section 149, the national highway freight program under section 167, the carbon reduction program under section 175, to carry out subsection (c) of the PROTECT program under section 176, and to carry out section 134.