15. What does the sign mean?

A. You can be in the reverse direction.

B. You can turn around.

C. You cannot be in the reverse direction.

D. All vehicles can move on this road.

16. What does the sign mean?

A. You are allowed to move ahead.

B. You can turn left.

C. The speed limit is 60 km/h.

D. You are forbidden to go straight.