The HOV lane signs on several freeways do not give times. Does this mean, "All the time"? (I saw people driving "solo" in them - just as they frequently do during "on" hours on the Nimitz in the Bay Area - which doesn't help answer this.)
In particular, I drove across the basin a couple of weeks ago (LAX to the Norton Simon in Pasadena) and saw for the first time the Harbor Freeway (110) with THREE diamond lanes in each direction, in addition to seven regular lanes, at times. Wow. I was alone, so I only marveled. But this week, I'm with my son, and so it really matters.
I am embarrassed about asking this, as I lived in LA for several years - obviously a long time ago - but I don't know where else to ask, and one prevailing tenet on Trip is that "there is no stupid question".