Grinding all traffic in all directions over multiple lanes to a stop when a school bus stops

This varies by state, but I think I most of them are setup so that you don't have to stop if the road is divided, or if there are more than 4 lanes (so 2 lanes for each direction, plus a turn lane in the middle, you don't have to stop). As always, check your local laws, and when in doubt, signal and stop.

Edit: to clarify, the oncoming lanes don't stop, the lane behind and adjacent to the bus still have to stop.