i try to do it smoothly, not for passenger comfort, but for the least effect on the stability of the car, since this is being done at high speed.

my favorite passing maneouver is over a high-speed bend of the highway: if the highway turns left and I want to switch one or more lanes to the right, I just follow a larger arc than the natural bend of the road.

if the road bends right and i want to overtake a left-lane bandit, i just overtake on the right, hitting the apex of the bend and gradually merging into the left lane. Quite thrilling especially if done across 2 lanes.