Truck and Bus Regulation
On-Road Heavy-Duty Diesel Vehicles (In-Use) Regulation

This page last reviewed July 14, 2017

On Road Vehicles


The regulation requires diesel trucks and buses that operate in California to be upgraded to reduce emissions. Newer heavier trucks and buses must meet PM filter requirements beginning January 1, 2012.  Lighter and older heavier trucks must be replaced starting January 1, 2015. By January 1, 2023, nearly all trucks and buses will need to have 2010 model year engines or equivalent.
The regulation applies to nearly all privately and federally owned diesel fueled trucks and buses and to privately and publicly owned school buses with a gross vehicle weight rating (GVWR) greater than 14,000 pounds.  The regulation provides a variety of flexibility options tailored to fleets operating low use vehicles, fleets operating in selected vocations like agricultural and construction, and small fleets of three or fewer trucks.  

For other information about this regulation, other diesel engine regulations, or training programs, please contact an ARB diesel representative at 866-6DIESEL (866-634-3735) or visit the Truck Stop website.  This regulation does not apply to drayage trucks that transport marine containers.

Please sign up to receive email updates at the Truck and Bus Regulation Listserve.

What's New: 

Three Day Pass Now Online (July 12, 2017)
  • Vehicle owners are now able to claim a Three Day Pass online. Read the Three Day Pass Online User Guide to see if you are eligible and to claim a Three Day Pass for one vehicle per fleet per year.

What's New Archive