[PCC]

If all roads were smooth and with a constant camber then I would agree that a tyre needs to be developed for such a situation.

However they are not - we have centre camber, left camber and right camber at a variety of falls.

On top of that we have surface irregularities, pot holes, uneven wear and other contributing factors that influence any design intentions.

I build roads and I can say that the finished product never is as per the design and has a multitude of variations.

I'm with Burgs and Sniper - well summed up!