"Should I sprint down the street to catch that bus? No, the next one is coming in 5 minutes."
"What bus lines run through Melrose and Western? The 10, 207, and 757. The 14 is close, and the 4 is close too."
If you're going to take public transit in Los Angeles (or anywhere, really), NextBus is a lifesaver.
NextBus + Uber/Lyft = carless in Los Angeles.