Transjakarta Busway which is still a great thing to use for next to nothing (3,500 for as far as you like if you dont get off and leave the network) has changed the way you access the bus system.
You need you Flazz card or Emoney card to get you into the network but now you also need to swipe the card to leave it as well.
There are a lot more buses on the network as well including Kopaja. Most useful tip, if the first bus you see is sardine tight then wait for the next one and it is most likely to be empty or emptier, as is the way with people using buses here.