A document titled "2018 Modified Roof Setbacks for Residential Solar PV Systems"
just came to my attention.

This looks very useful for all you Cali installers.

Is it enforced by all AHJ's in CA?
or is it up to their own year of adoption of the triennial code cycles?
or at their discretion whether they like it or not?

It seems a lot more lenient:
-18" in many cases rather than 36"
-one pathway rather than two in some cases.

Who is familiar with this?