How far can the blind spot behind a school bus extend?

The blind spot behind a school bus can extend up to 400 feet. This significant distance highlights the importance of caution for drivers approaching a stopped or slow-moving school bus. When a bus has its stop sign extended, it is crucial for other vehicles to be aware that children may still be in the vicinity, potentially crossing the road. Understanding the dimension of this blind spot helps ensure that drivers give ample space for safety and remain vigilant for pedestrians, particularly children, who may not be easily visible from the bus driver's perspective.

In contrast, shorter distances listed in the other choices do not adequately represent the actual risk involved when navigating near a school bus. Being aware of the 400-foot blind spot emphasizes the necessity for drivers to exercise additional caution and patience when they encounter school buses on the road.