1. You are permitted to cross the lines. However, vehicle traffic from the opposite direction is not permitted to cross them.
  2. You are permitted to cross the lines. However, vehicle traffic from the opposite direction has right of way.
  3. You are permitted to cross the lines because the driver has right of way.
  4. You are forbidden to cross the lines. However, a vehicle from the opposite direction is permitted to cross them when the road is clear.