What speed must you drive when approaching a school zone during school hours?

When approaching a school zone during school hours, it is essential to adhere to the posted school zone speed limit. This speed limit is specifically established to enhance the safety of children and pedestrians in these areas, which typically see increased activity during school hours. Driving at the posted limit ensures that you are driving at a safe speed, allowing for more reaction time should children enter the roadway unexpectedly.

The other options either suggest maintaining the standard speed limit for regular roads or modifying the speed limit in a way that does not prioritize the safety of individuals in school zones. It's crucial to understand that school zones are specifically designed to protect children, and following the posted speed limit is a legal requirement that contributes to overall road safety in these areas.