A.R.S. § 28-901: Maximum number in school bus; stops at school

A. Except for the purpose of conducting drills under school rules and in the emergency evacuation or dispersal of pupils and school personnel, a person shall not operate a school bus on a public highway:

1. While carrying more passengers than can be properly seated.

2. While a person is standing in the school bus.

B. In receiving or discharging children at the school, a person who drives a vehicle carrying children to and from school shall stop the vehicle on the side of the highway on which the school is located.