How are working limits established on non-controlled track?

Establishing working limits on non-controlled track is crucial for the safety of roadway workers. The correct choice, which mentions that working limits are defined through inaccessible track, highlights a fundamental method used to maintain safety during maintenance or repair activities.

Inaccessible track signifies that certain sections of the track are made unavailable for train movements. This can be achieved through physical barriers, but the core idea revolves around ensuring that trains cannot operate in those particular sections. By identifying and marking areas as inaccessible, workers can operate with a reduced risk of being in the vicinity of moving trains. It is essential for everyone involved to be aware that those sections are restricted to eliminate the possibility of accidental train incursions.

The other options present alternative methods of managing safety but do not apply to the specific context of using non-controlled track for defining working limits. For example, barriers or signals might be used in different scenarios or within controlled environments, but they do not specifically denote how access to non-controlled track is restricted for safety during work. This understanding is critical for workers to ensure proper safety protocols are followed while on-site.