Dorothy Parker called it "seventy two suburbs in search of a city." LA is what happens when you give everyone the detached single family home despite the area being an economic hub. Zoning needs to change to let developers build up (with appropriate seismic precautions) and the city needs to make massive investments in grade-separated rail (stilts are cheaper than tunnels) and bus-only lanes on major streets that allow public transit (especially the rapid buses) to be faster than driving your car. Letting buses sit in traffic gives people no incentive to use them, because they offer no advantage above your car. The virtuous cycle (supplemented of course by curb-separated bicycle lanes) would entice more people to use public transit, thereby easing traffic for those motorists for whom their living or work situation doesn't permit it. I grew up in LA. I'm still recovering.