California Air Resources Board Information and Links
The California Air Resources Board website is a good place to start for all the info.
CARB Home Page
PERP – Portable Equipment Registration Program:
This applies to any engine mounted on a trailer, like a chipper or stump grinder.
PERP Program Page
Here’s a PERP FAQ sheet with lots of answers to your questions.
PERP Questions and Answers (PDF)
CARB’s Truck and Bus Regulation page covers on-road diesel truck rules. It gets pretty complicated, so take your time and read it carefully.
Truck and Bus Regulation
For on-road diesel truck certification requirements, see CARB’s heavy-duty certification program page.
On-Road Heavy-Duty Certification Program