On a route that is NOT fleeted, each signal in the route will?

In a non-fleeted route, the behavior of the signals is designed to ensure safety and control over train movements. When a signal displays a restriction—such as "Danger"—it indicates that the track beyond the signal is not clear for movement. Once a train passes the signal, it will typically remain in the "Danger" aspect. This is crucial for preventing accidents and ensuring that subsequent trains do not proceed into a potentially hazardous situation without a proper examination of the track.

The signal's ability to stay at "Danger" after the train passes serves as a protective measure, ensuring that any following train cannot proceed until a dispatcher, signal maintainer, or tower operator has verified the track's safety and cleared the signal intentionally. This automatic behavior is a key feature in maintaining operational integrity and ensuring that the route remains secure against unintended movements that could lead to collisions. The other options imply a change in the signal's aspect under circumstances that would not occur in a non-fleeted situation, making the understanding of why the signal remains at "Danger" essential for the operation of the railway system.