What is a common feature that should be determined by checking the bus doors?

Determining whether the bus doors are present and secure is crucial for the overall safety and functionality of the vehicle. Properly functioning doors are essential for protecting passengers and ensuring that they can enter and exit the bus safely. If the doors are damaged, missing, or unsecured, it could lead to serious safety hazards, such as passengers falling out while the bus is in motion or unauthorized entry.

While other features, such as being colorful or having a sound system, may enhance the bus's aesthetic or entertainment value, they do not impact the fundamental operation and safety of the vehicle. Additionally, while ease of opening is important for accessibility, it is secondary to ensuring that the doors are secure and functioning properly. Thus, the emphasis on the doors being present and secure aligns with the primary objectives of safety and readiness in a pre-trip inspection.