Right, and when the junction design forces you to take the route you already decided on all of those decisions are moot. You are forced to decide _before_ you're mid-junction with people going all sorts of different directions. When you take the wrong offramp do you back up on to the freeway?

The toll road example is fair, though I don't know the particulars of this in Australia.

I recently drove from Normandy to Amsterdam and halfway through Belgium I took the wrong exit and ended up adding 20 minutes to the drive. But it was fine.