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    commuters did not find new routes because surprise! there aren't any

And there’s your problem - alternatives, even mediocre ones, are a prerequisite. And as far as I remember (I’m getting GDPR’ed on your link, can’t even visit the site) LA doesn’t have good alternatives to driving. I didn’t mind biking around NYC, but I would feel in danger in LA.

Road alternatives are also a part of the solution. Braess’ Paradox comes to mind, which traffic models can’t handle. Another way the trips evaporate in cities like Paris (besides mode changes) is that these kinds of measures diverts traffic away that doesn’t have their start or end point near those waterfronts.

The LA road network can’t handle that because it can’t handle shit in the first place.