How can the other driver help a vehicle for passing by?

• Signal with your hands when there is no traffic coming.
• Honk the horn when there is no traffic coming.
• When being passed on a two-lane highway, help the driver passing you by staying in your lane. Move to the right side of your lane to give the other driver a better view of the road ahead.
  Explanation:

  "When being passed on a two-lane highway, help the driver passing you by staying in your lane. Move to the right side of your lane to give the other driver a better view of the road ahead."
• Passing on two-lane highway is not permitted.