Which of the following is NOT a prohibited stop location for school buses?

The identification of a stop location as "not prohibited" for school buses is based on the safety considerations established for the protection of children and the efficiency of school transportation. A completely vacant street offers an environment where no other vehicles or obstacles are present, which mitigates the risks often associated with bus stops, such as traffic congestion and visibility issues.

In contrast, stops within 200 feet of a railroad crossing are prohibited to avoid potential dangers associated with train traffic. Stopping on the left-hand side of any highway is prohibited as it poses substantial safety risks for children disembarking from the bus. Additionally, stopping on divided highways where pupils would need to cross presents significant danger, as pedestrians navigating vehicular traffic increases the likelihood of accidents.

Therefore, while certain locations present identifiable hazards to student safety, stopping on a completely vacant street does not impose such risks and is thus permissible.