Dovey: In the US (and Canada, I think), a 4-way stop and an all-way stop function the same way, but the all-way signs are used when there are other than 4 approaches to an intersection. You have to stop at the line, and if you reach the line at the same time as someone else, yield to the traffic on your right. Most people tend to proceed at the same time as the oncoming traffic across the intersection, with left-turners yielding. I don't know if this is really acceptable, but cops don't stop us, so I guess it is.