Imagine there is a uncontrolled four or three way intersection (No sign, No signalization). And assume the roads have same priority.
In this case, the rules are:
1. First in first out (The vehicle that reaches the intersection first should proceed first)
2. If several drivers reach a four way intersection at the same time:
a. Drivers on the left must yield to the drivers on the right.
b. Vehicles turning right or left must yield to oncoming (straight) traffic.
What if two vehicles reaches the intersection at the same time and if the situation is as shown in the figure. Which vehicle has the right of way?
If A and B reach the intersection at the same time and the intersection is a four-way stop sign intersection, then the B, from the right side of A, has precedence. For example, A does not even necessarily know that B wants to turn left. Whether B has his turn signal on or not should make no difference. If A and B were both to go straight through, the same rule holds.
However, if A wanted to turn right, I don't think it needs to wait for B. A can turn right at the same time that B is turning left. Especially if both of them are signaling their intentions, as they should be, this causes no problem.
In roundabouts, in places where people drive on the left side of the road, the rule that cars inside the roundabout have priority makes sense. That's because anyone wanting to enter into the roundabout has to let cars from his right go through first.
It is instead confusing in places where people right on the right side. In roundabouts, you always have to give precedence to vehicles inside the roundabout, but these vehicles are arriving from your left side. Which may explain why roundabouts are not as popular in countries where you drive on the right.
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