Stopping Unlawfully

"A vehicle may not stop in a roundabout"

Some scenarios allow you to stop in a round about, eg: when a queue is forming or there was an accident

Thus its important to note that not every scenario can have its own sign posted, and you need to have good understanding of each place where you drive and stop. Example: country roads, round about, freeways. residential area etc

Residential area eg: You may not stop in a curve where visibility is obstructed.

Driver license handbook