Under what condition can a lone worker use individual train detection for on track safety?

The correct answer pertains to the specific requirements that ensure the safety of lone workers in on-track environments. Individual train detection is a critical aspect of maintaining safety when working alone. A worker must know the required sight distance to implement this safety measure effectively, as it determines how far away a worker can see an approaching train, which is fundamental for making informed decisions regarding their safety.

Additionally, having completed a statement of on track safety (SOTS1) demonstrates that the worker understands the processes and procedures for working alone in the rail environment. This statement acts as a form of risk assessment and planning for the work task, indicating that the lone worker has the knowledge and guidelines necessary to operate safely.

Without the knowledge of sight distance and the completion of SOTS1, a lone worker might be ill-equipped to identify or react appropriately to the presence of a train, which poses a significant risk to their safety. Thus, the requirement ensures that the lone worker can take necessary and informed precautions to maintain safety while working on the tracks.