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Advanced Clean Fleets Resources

ACF Artwork

Advanced Clean Fleets Regulation
Enforcement Advisory Update

On December 28, 2023, CARB published the following advisory regarding non-enforcement of the Advanced Clean Fleets (ACF) regulation pending a waiver determination by EPA.

Those of you subject to the drayage rule should continue to register your legacy fleets prior to 1/1/24.

Please take note of the wording of the drayage registration requirements and how they differ from High Priority Fleets.

High Priority Fleets are being provided more flexibility to register under this advisory.


In Case You Missed It
CARB Pauses ACF Enforcement

Please see the attached letter from CARB regarding enforcement of the ACF pending issuance of a waiver determination from EPA. This stay of enforcement is the result of many hours of discussions by CTA with CARB and the Attorney General’s office. CARB plans to release an enforcement advisory to regulated entities soon reflecting this agreement.

Some highlights of this agreement:

  • CARB has agreed not to enforce the reporting or registration requirements of the ACF as it applies to high priority fleets and drayage until a waiver determination is issued by EPA.
  • Fleets may voluntarily report and apply for flexibility provisions.
  • CARB reserves the right to take enforcement action to remove internal combustion trucks added after 1/1/24 that would not otherwise be in compliance with the ACF.

While there is no set time for granting of a waiver by EPA, waivers typically take 9-12 months to process. CARB applied for this waiver on 11/17/23.

On April 28, 2023, the California Air Resources Board (CARB) passed the Advanced Clean Fleets (ACF) regulation. The ACF regulation will require truck owners to transition their vehicles to zero-emission trucks starting in 2024.

There are two requirements that our members may have to comply with: Drayage Truck and High Priority Fleets Requirements. The Drayage Truck Requirements will apply to all class 7 and 8 trucks that visit a seaport or intermodal railyard except exempt types. The High Priority Fleets Requirements will apply to fleets with 50 or more trucks or with annual revenue of $50 million or more.