What does the signal aspect meaning "proceed, prepared to stop at next signal on main route" instruct the operator to do?

The signal aspect that instructs "proceed, prepared to stop at next signal on main route" specifically indicates that the train operator should move forward while maintaining awareness and readiness to stop if the next signal indicates a halt. This is a critical instruction that ensures safety by allowing the operator to keep moving while being prepared for any potential changes in signaling. It emphasizes the importance of vigilance, as the operator needs to be attentive to the upcoming signal, ensuring that they are ready to take necessary action at a moment's notice if the circumstances change. Understanding this aspect helps ensure smooth operations while prioritizing safety on the main route.