The U.S. light-duty vehicle market represents a key test bed for some of the world’s leading vehicle regulatory policy programs. At the federal level, standards for model years 2022-2025 were established in 2012 under the Greenhouse Gas (GHG) Emissions/Corporate Average Fuel Economy (CAFE) program. At the state level, the Zero Emission Vehicle (ZEV) mandate portion of California’s Advanced Clean Cars program, adopted by nine other states, was most recently revised at about the same time. Although both are emissions-related policies, they are concerned with different time frames and aspects of the vehicle market. The forthcoming mid-term review for both programs presents an ideal opportunity to reassess likely outcomes in light of new information and changing market conditions, and to align them with policy expectations.