What is the indication of a signal instructing to proceed prepared to stop?

The indication of a signal instructing to proceed prepared to stop is that trains must be ready to stop at the next signal. This type of signal communicates that while trains are permitted to move forward, they should be vigilant and prepared to respond to the next signal's indication, as it may require a halt. This is especially important in ensuring safety, as it allows train operators to maintain control and avoid potential hazards along their route.

Being prepared to stop means operators should be ready to adjust their speed if necessary, ensuring they can respond promptly to any changes in signals or track conditions that may arise. This situational awareness and readiness enhance the overall safety and efficiency of train operations, aligning with operating protocols.