When the yellow lights are flashing, all drivers approaching ________ must obey the speed limit posted on the sign.

Explanation

School zones are sensitive areas because children from all directions can cross the road when school is in session. "Speed Limit When Flashing" signs are posted before a school to indicate a reduced speed limit in a school zone. These signs have yellow lights above a speed limit. You must obey that lower speed limit whenever the yellow lights are flashing.