it actually works great with less people. the problem is hitting that threshold requires regulation, which is a political impossibility except for special events.
So less people driving leads to less traffic, what a surprise.
I think that LA takes pride in its traffic, like some kind of shared struggle.
It is the only city I have lived in that has an implied 30 minute allowance for traffic delays. Everyone understands and you can use the excuse anytime or day of the week.
I've hit gridlock at 3am on the 101 before. The whole city feels like it was designed to be some elaborate torture device for commuters.