On a two-lane road with a 55 mph limit, you come up behind a farm tractor that moves at 15 mph. The center line on your side is solid yellow. When may you cross the center line to pass the tractor?

Correct answer: When you can see enough clear road and can pass without going over 55 mph.

Why

All three conditions must be true at the same time: the slow vehicle is under half the posted limit, you stay at or below the limit while you pass, and you can see enough of the other lane. Farm machinery may turn left into a field or driveway without much warning, so watch for its signals and pass with care. Do not pass near a hill, curve, intersection or railroad crossing.

Verified against Ohio Driver Manual · Slow moving vehicles · p. 41, 24