What indicates that the bus door seals are intact?

A securely closing bus door indicates that the door seals are intact. When door seals are in good condition, they create a proper seal when the door is closed, preventing air leaks and ensuring that the door functions correctly while maintaining the safety and comfort of passengers. A door that closes securely suggests that the seals are effective, which is essential for minimizing noise, dust, and water ingress during transit.

In contrast, if a door opens with excessive force, it may point to alignment or seal issues that could compromise its function. Similarly, if a door is deemed only partially operational, it could suggest that the seals are worn or damaged, leading to potential safety concerns. Although a door not needing maintenance may imply that it is functioning well, it doesn’t specifically confirm the condition of the seals like a securely closing door does. Thus, the condition of the door seals is best assessed by observing how well the door closes.