As reported to MUFONCT: While driving south on rt 89 near South Royalton, VT I spotted huge dark, metallic gray with sectioned plated (and small hump in center) flying saucer traveling at a near perpendicular position to my left view. Saucer came into front view and went behind a hilltop where I lost sight of it. My two companions could not be roused from a trance-like state, so they never observed what I did.