Unless a special hazard exists, the speed limit for a school bus with a commercial motor vehicle inspection is __________ mph.

The correct answer is based on the regulatory framework that governs the operation of school buses, particularly those that carry commercial motor vehicle inspection standards. In most situations, the maximum speed limit for a school bus is typically set at 60 mph, except in areas where special hazards are present, which could necessitate lower speeds for safety reasons.

This regulation is in place to prioritize the safety of children who may be boarding or disembarking from the bus, as well as to account for the unique driving circumstances that can occur around school zones. The intent behind establishing a speed limit of 60 mph is to ensure that school buses can operate safely on highways while also allowing sufficient speed to maintain flow and efficiency on roadways where heavier traffic might moderate the speeds.

Other higher speed limits specified in the other choices are generally reserved for different types of vehicles under different regulatory conditions and do not apply to school buses operating under the established safety parameters set forth in transportation codes.