At all airports where I've looked out the window during taxi, the taxiway intersections have been painted with nice circular arcs connecting (the centerline of) each entry to the intersection with each exit.
I've always assumed these lines were there to guide planes through the turns -- that is, if the nose wheel follows the curved line exactly then you're guaranteed that there'll be pavement under the path the main gear will follow, and there will be sufficient wingtip clearances for the aircraft types allowed to use the intersection, etc.
However, in this question it comes to light that pilots can't even see the curved centerlines while they're turning and rely on spatial intuition instead. Very well, that seems to work fine in practice.
Which leads to the question: Who are the curved centerlines for, then? What would go wrong if they weren't there and instead just the straight centerlines of the intersecting taxiways continued through?
Possibly the pilots of smaller aircraft than the intersection is built for (say, a Dash-8 in an intersection that can take A380s?) can see the curved lines ahead of them while they turn. But in that case they should have plenty of room to do the turn by intuition too, right?
