This example live stream on YouTube Live (Akihabara Live Camera*) is being broadcast at approx. 2Mbps for both up and down.
*Akihabara Live Camera has been broadcast via LiveShell W. The recommended bit rate is 8Mbps if you want to broadcast 1920 x 1080 60fps, and 4Mbps if you want to broadcast at 1920 x 1080 30fps.