Painted Lines on the Freeway ... what does this mean?

What are all of these lines supposed to mean?

I noticed these lane markings on the side of the High-Occupancy Vehicle (HOV) lane on Interstate 5.  Does anyone recognize this odd combination of a solid white PLUS double-solid-yellow?  What does it mean ... if I cross it for any reason will I have to pay a $2,000 fine?

I went to the California DMV website.  There is no way to ask a question via the Internet.  Their website links to the drivers' handbook, but that scholarly work does not answer this question.