In LA, there are little to no bus lanes. Trying to introduce them is nonsense. You'd have to rip up the sidewalk too make the room. If you try to convert the street into having just one bus lane each way you have now converted 2/6 lanes into bus lanes, sometimes 2/4 lanes. The car traffic already extends for blocks/miles if you are trying to get onto the 405 from the Westside, bus lanes would extend it to a third to twice as long as it is. People would flat ignore the bus lane too, probably a Beemer driver. And if you think that the cops are going to ticket anyone, you have never driven in LA traffic at rush hour. You could kill 10 people in broad daylight, as long as you did not cause gridlock, and the LAPD could care less. LA is just plain super messed up with traffic from a structural level. New developments can be more dense, and many are. But if your job, your kids' schools, your spouse's job, and your grocery stores are not within walking distance (and are suuuuper stable) then you must have a car as the system currently is. These problems are not going to go away anytime in the next decade to half century.