Daimler Truck North America (DTNA) has ceased accepting orders for new diesel-powered trucks and buses in Oregon, citing compliance challenges with the state's implementation of Advanced Clean Trucks (ACT) regulations. This move, confirmed in late December 2024, impacts Freightliner, Western Star, and Thomas Built Buses, key brands in DTNA's portfolio. Rival manufacturers Volvo Trucks North America (VTNA) and Mack Trucks have opted to limit their diesel sales in Oregon rather than halt them entirely, adding to the industry-wide disruption caused by the state's emissions mandate.