When is it permissible for a school bus to operate on a freeway?

A school bus is permitted to operate on a freeway only if it is designated as a school bus route. This regulation is in place to ensure the safety of students and other road users. Designated routes are typically selected based on safety, traffic patterns, and proximity to schools. Operating a school bus on a freeway is generally restricted due to the higher speeds and potential hazards associated with freeway traffic. Designation helps authorities manage and monitor bus traffic effectively, ensuring that students can be picked up and dropped off safely.

The other options do not align with the safety regulations governing school bus operations. Operating during busy school hours does not inherently ensure safety and could lead to increased risks. Running a bus on a freeway after sundown disregards safety considerations about visibility and traffic conditions. Allowing drivers to operate a bus on a freeway whenever they feel it is safe is subjective and could lead to hazardous situations; safety protocols need to be standardized to protect all road users.