Which teaching method is most effective for introducing a student to highway merging for the first time?

1. Have the student watch a video and then attempt merging immediately
2. Demonstrate the technique first, then have the student practice on a low-traffic highway
3. Allow the student to figure it out on a busy highway during rush hour — this approach skips the demonstrate-then-practice sequence instructors should use.
4. Skip highway merging until the student has a full license