It looks like this announcement was a couple of years ago and some more concrete info is now available e.g. https://ww2.arb.ca.gov/resources/fact-sheets/advance

It looks like this announcement was a couple of years ago and some more concrete info is now available e.g. https://ww2.arb.ca.gov/resources/fact-sheets/advanced-clean-trucks-fact-sheet https://ww2.arb.ca.gov/resources/fact-sheets/advanced-clean-... It actually seems quite weak; a slow requirement for manufacturers to start shipping zero emission trucks, and a requirement for fleet operators to report.