I encountered my first serious experience with the road destroying phenomena called "frost heaves" between here and the U. S. border. In fact, several kilometers of road around Kluane Lake was in the process of being rebuilt because of this. Sections of the road looked like the Royal Canadian Airforce was using them for bombing practice. Then it would become smooth sailing, I would let the bike drift up to 70mph, then "oh shit!" I caught some serious air time. I just couldn't see these dips in the road far enough out. That happening once was all it took to regain some commonsense, and slow down.