Left lane reverts to turning left only

What is the meaning of the following road marking?

1. It is forbidden to turn left from the left lane.
2. You have right-of-way on the narrow road over opposite traffic.
3. Only driving forward is permitted.
4. Correct answer: Left lane reverts to turning left only.

What does it mean when a yellow arrow pointing straight ahead is marked on the road?

1. All vehicles are permitted to drive straight, but right-of-way should be given to buses.
2. Every vehicle carrying at least six passengers is permitted to continue straight forward.
3. Correct answer: Only public vehicles are permitted to continue driving straight ahead at the coming intersection.
4. Private vehicles are permitted to carefully drive straight.