It's a numbers game mate, and you're right, primary isn't always the correct place to be. All road positioning is about communicating and balancing risks, not eliminating them. For example primary when passing a side road reduces the chances of an accident from: * A driver left hooking you * Some other driver in the side road poking his bonnet out too far because he can't see down your road. * A third oncoming driver turning right in front of you On the other hand it slightly increases the chance of "being taught a lesson" by an angry and impatient driver behind you. This last is reduced by the move out to primary and a good look behind you into his/her eyes before reaching the side road. Overall, in this situation, being well out in the lane makes you a winner in most encounters.