What action must a driver of a type 2 school bus take when stopping at a railroad crossing?

When a driver of a type 2 school bus approaches a railroad crossing, it is essential for them to take the proper safety measures to ensure the safety of all passengers on board. Opening the driver's window enables the driver to hear any approaching trains more clearly and allows for better situational awareness. This action is crucial at railroad crossings, as it allows the driver to listen for sounds that indicate a train is nearby, including warning bells or the rumble of a train's approach.

In addition to this, the driver must also engage in other safety practices such as stopping at the crossing, checking for visual indications of a train, and ensuring that it is safe to cross. While other choices may imply additional actions, opening the window specifically enhances auditory awareness, which is a critical component of safely navigating a railroad crossing. Therefore, this action is part of a comprehensive set of behaviors aimed at maximizing safety around railroad crossings.