Arizona Rrevised Statutes § 28-797 makes it a violation to pass another vehicle in a school zone. Section 28-797(E) states that the maximum speed limit in a school zone is 15 mph. It is illegal to pass any vehicle in a school zone. Passing is defined as the front bumper of a vehicle passing the front bumper of another vehicle.
One way to be protected from getting a ticket in a marked school zone is to give yourself additional travel time. Drivers in a hurry are more apt to pass the slowest moving vehicle in the school zone, which is a violation. These drivers are also prone to getting upset with other drivers traveling below the posted speed limit in a school zone. Do yourself a favor and either leave earlier than the posted school times or after the starting times of the schools you may be traveling past.