Cars can pass the school bus after the stop sign is no longer out, the school bus has begun driving or the bus driver signals you can pass.
When there are four lanes, the side of traffic without a stopped school bus can continue driving, preferably cautiously.

When there is a raised divider, like a median in between the different directions of traffic, the side of the road without a stopped school bus can continue driving, preferably cautiously.
Cars on a two-lane road with a median also do not have to stop if the bus is stopped on the other side of the road.
