15. What does the sign mean?

A. The minimum speed is 30 km/h.

B. The maximum speed is 30 km/h.

C. The average speed is 30 km/h.

D. There are 30 barriers ahead.

16. What does the sign mean?

A. Motorcyclists are permitted to go on this street.

B. Motorcyclists aren’t allowed to go on this street.

C. All vehicles can go on this street.

D. This street is for motorcyclists only.