[Zeke]

While that answer does seem obvious to me, I think there is another answer to the question as the original question did not mention uphill v. downhill. The dynamics of the radii in the turns will favor speed in one direction over the other even assuming that the road is secure and you can use all of it.

But, the idea does bring up an interesting idea. Race Pike's Peak downhill. I wonder how far off his record Loeb would be.