The rule exists to prevent intersections from getting blocked by idiot drivers who enter too late and get stuck, which if not immediately cleared will cause gridlock to begin forming.
I find it a bit hard to believe that such a rule doesn't exist in America.
https://www.theglobeandmail.com/globe-drive/culture/commutin...
https://www.theglobeandmail.com/globe-drive/culture/commutin...
In Ontario, the law doesn't say where cars should wait when waiting to turn left at a green light.
Apparently, that silence means a queue is allowed. In an e-mail, Ontario's Ministry of Transportation (MTO) tells Globe Drive that "more than one car is allowed to enter an intersection on a green light to line up to make a left turn, provided that the car's turn signal is on before it enters the intersection."
But, beware of local bylaws. If an intersection has a sign that says "Do not block intersection," you shouldn't be waiting inside it to turn, police say.
When I was driving (I don't really drive anymore), I found it common practice to queue in the intersection while waiting for a left turn.
Although, I suppose counterexamples exist: https://www.youtube.com/watch?v=gdNWP6tmJHw&t=1m23s
Yes, that is how it's supposed to work here. But when you enter because there isn't any traffic coming and you assume the waymo vehicle will do the obvious and turn left, and then it just stops, it's very easy to get stuck out in the intersection behind it - in a situation that wouldn't happen with any human driver.
I take it that in Australia, you drive on the left side of the road? In North America, you drive on the right side of the road, so the logic would apply when you're turning left, not right.