Latest On CARB’s Advanced Clean Truck Rule And Impact In Other States

The California Air Resources Board’s Advanced Clean Truck Rule has been adopted by ten other states across the country. Rules in Massachusetts, New Jersey, New York, Oregon, and Washington took effect with the 2025 model year. Meanwhile, rules in Vermont will take effect with the 2026 model year, and those in Colorado, Maryland, New Mexico, and Rhode Island will begin the 2027 model year. 

Find out more information below on the rule itself, the rule's legislative status in the adopting states, the timelines for implementation, and the RV Industry Association's next steps. 

Background Information

The Advanced Clean Trucks (ACT) regulation was adopted by the California Air Resources Board (CARB or Board) in 2021 to establish zero emission vehicle standards for medium and heavy-duty vehicles. While the regulation does not specifically ban motorhome sales, the ACT regulation mandates manufacturers of medium and heavy-duty vehicles to sell an increasing percentage of ZEVs each year. This has led some chassis manufacturers to halt sales of traditional internal combustion engine chassis for motorhomes in California, stemming from the lack of ZEV chassis suitable for motorhomes. 

Status of ACT in Other States

Legislation has been introduced in all of the 2025 states to delay implementation of the rule until at least 2027. Below is the status of each of those bills:

• New Jersey: A.4967 had a hearing in early December last year in the Assembly Transportation Committee, which unanimously reported out the bill to the full Assembly.
• Oregon: The House Committee on Climate, Energy and Environment held a hearing on HB 3119 in late January and has scheduled another for this week. The RV Industry Association has submitted a written statement for the record in support of the legislation.
• New York: The RV Industry Association has signed onto a coalition letter being sent to Governor Hochul expressing support for a delay in implementation of the rule. In addition, A. 6359 and S. 5931 have been introduced to delay implementation until July 1, 2027.
• Massachusetts: Nine different bills have been introduced to delay the implementation of ACT until 2027 or 2029. Last week, the RV Industry Association signed on to a letter being sent to Governor Healey, leadership in the House and Senate, and the chairs of the House and Senate Ways and Means Committees seeking a delay in the implementation of the ACT rule there through the FY 2026 budget process.
• Washington: SB 5091 has been introduced by Senator Matt Boehnke to repeal the adoption of CARB’s ACT in the state. The RV Industry Association has also joined the Washington Trucking Association’s ACT Coalition.
• In Maryland, which implements the rule in 2027, a hearing was held last week on HB 1556 to delay the penalty phase of the ACT rule and the Advanced Clean Cars II rule until 2029. The House Environment and Transportation Committee unanimously reported the bill last week. However, due to the very limited time left in the Maryland General Assembly session for this year, Governor Moore has signed an Executive Order that is intended to replace the legislation. It empowers the Maryland Department of Environment to maximize discretion in the enforcement of ACT for model years 2027-2028. It also creates a Working Group to develop recommendations for how the Advanced Clean Cars II and ACT programs can be successfully implemented.

The Next Steps

RV Industry Association staff will continue to work with the state trucking associations and other interested stakeholders to seek a delay in implementation or a repeal of the rule in the five states in which a rule took effect in the 2025 model year, as well as begin working with states that have implementation in 2026 and 2027.