Came across this situation the other day (I was in the red car turning right) and was wondering , what's the order of the right of way in this situation? Is my understanding correct in that it's supposed to be blue, green then red?
Edit: The intersection in question (from my point of view - the red car), since MS Paint wanted a window and chimney (sorry no squiggly smoke or door)
Edit 2: Poll added as per nobro25's request
First up, all cars need to give way as their roads are terminating at t-intersections (or, in the case of the blue car, at a driveway).
The green car gets to go first, and does not need to wait for the other two. They do, however, need to give way to their right (i.e. traffic already on the road).
The red car must give way to all cars on both sides of the street - those coming from its right and its left. Assuming they are allowed to turn (and the line isn't unbroken, as in the diagram, but is actually a broken line) they need to give way to the green car and any other cars in that lane.
The blue care must give way to all traffic already on the road (i.e., the green car and any other car). I'm assuming that's a driveway, and not a one-way road. They aren't yet on the road, so must give way to all traffic, including the red car, before they can get onto the road.
If I was the red car, I wouldn't proceed into that intersection unless it was safe to exit it. If that meant waiting for the blue car to back out, that's what I would do.
If I was the blue car, I wouldn't back out until it was safe to enter the road. That would mean, giving way to the red car.