I used a simple map of the neighbourhood of LA on the net (not very precise though). Your link is a gold mine, a very big thanks for that !! I'll probably use it a lot and redo some of the borders.
I'm not making an actual map of LA (even if it's close too). It's for a not-so-distant future rpg setting (in 2085), so there will be some differences. One of them : I consider all the freeways to be above the ground and with a metro line under it. So a lot of metro lines, but not underground (and no more the old lines). Each number on the freeways are both stations and interchange.

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