Final answer:
The school zone sign is typically posted 1 block before a crosswalk to alert drivers to slow down and be cautious. This ensures the safety of students crossing the road.
Step-by-step explanation:
The school zone sign is typically posted 1 block before a crosswalk. This is done to alert drivers to slow down and be cautious as they approach the crosswalk.
The purpose of the school zone sign is to ensure the safety of students crossing the road. By having the sign placed before the crosswalk, it gives drivers enough time to adjust their speed and be prepared to stop if necessary.
For example, if a school is located on a road where the speed limit is 40 mph, the school zone sign would be posted approximately 1 block before the crosswalk to notify drivers to reduce their speed to the designated school zone speed limit, usually 20-25 mph.