What provides the widest view from a bus?

The interior rear view mirror offers the widest view from a bus because it is designed to provide a clear, unobstructed view of the area directly behind the vehicle, which encompasses a broader range than other mirrors. Positioned inside the bus, it allows the driver to maintain awareness of the space behind the bus without any distractions or obstructions that are commonly found in external mirrors.

In contrast, side mirrors are essential for monitoring lanes and ensuring safety during turns and lane changes, but they focus on specific angles rather than providing a comprehensive view of the rear. Exterior rear view mirrors complement this functionality, yet they are still limited by their design and placement, which may not capture the entirety of the bus’s back area. The front windshield, while crucial for the driver's forward visibility, does not contribute to seeing behind the bus at all. Therefore, the interior rear view mirror is the most effective choice for obtaining a wide, overall view from the bus.