Reading the comments is interesting to learn perspective.
Driving the Alcan quite a bit (commencing in 1976), it was a bit of a truism that the Canadian side...with it's at least relatively-well-maintained gravel...was generally smoother and allowed faster transit (at least for autos & trucks) than then contemporaneous crappily-paved roads in Alaska.
Obviously, things have changed in 40+ years, but I've always thought that a well-maintained gravel road had less disruption from the frost-heave effect than an asphalt road and that some Northern routes should have remained gravel.....but just opinion there.