The fifth scenario may be the most dangerous because the driver is not prepared to accommodate you. He didn’t plan to be on the wrong side of the road but swerved for an obstacle or went wide exiting a turn, usually because he was speeding. This is something to be wary of when you approach a corner. If it is a right-hander for you, an opposing driver may cut across the centerline in the corner to straighten out the corner. He will presumably have calculated the distances correctly and can get back into his own lane. However, the guy who exits a corner wide as you approach a left-hander (for you) probably doesn’t have any recourse. Trying to brake or pull it back down into his lane may cause him to lose control completely, which probably won’t help you either. A friend and I were riding in the Southern California mountains some years ago when two riders, apparently racing, emerged from the left-hander we were approaching, and both came across the center line. My friend was forced off the road and the riders bracketed me, one passing on either side, but still in my lane. If it had been a car, we would have collided. Approaching the corner wide and staying wide until you can see well into or through the corner is the best way to address this issue. It may be harder to prepare for the driver who suddenly swerves across the centerline on a two-way street. If you are attentive enough though, you may detect the problem before opposing traffic has to react to it.