How far should emergency reflective triangles be placed to ensure safety if the bus is disabled?

The correct answer emphasizes the importance of proper placement of emergency reflective triangles to ensure the safety of both the disabled bus and any approaching vehicles. The guidelines suggest placing the triangles 100 feet to the front and between 100 to 500 feet to the rear of the bus. This setup is crucial because it provides adequate warning to drivers about the presence of the disabled bus from a sufficient distance, allowing them to react and adjust their speed or change lanes accordingly.

The recommendation of placing 10 feet to the rear seems inadequate because it does not offer sufficient visibility for oncoming traffic, particularly on highways or busy roads where higher speeds are common. The distance of up to 500 feet in the rear accommodates varying road conditions and speeds, ensuring that drivers have time to see the reflective triangle and respond safely. Proper positioning not only protects the driver and any passengers inside the bus but also helps prevent collisions, which can lead to more serious incidents.

In contrast, the other options suggest distances that either do not meet safety standards or do not provide enough visual warning for approaching drivers, increasing the risk of accidents. Thus, the recommended distances outlined in the correct answer align with safety protocols established for commercial vehicle operation, particularly for school buses.