What should you do if an oncoming vehicle crosses into your lane on a two-lane undivided highway?

1. Brake firmly, sound your horn, flash headlights, and steer to the right shoulder; never swerve left into oncoming traffic
2. Swerve into the lane the other vehicle has just left, since it is now empty
3. Accelerate to pass the oncoming vehicle before it reaches you
4. Hold your lane and your speed, relying on the other driver to correct in time