LA has a lot of low hanging fruit with the classic "two parking lane four car lanes and a center turning lane" arterial that is laid out about every half mile in the cardinal directions across the entire county. Just nix the turning lane and two car lanes, and turn the existing bus lines that run along those arterials into BRT and LA would become a model for the western world of how to run low cost transit.
It will never happen of course, because the city council and most wings of local government are openly corrupt with regular FBI indictments.