Which situation indicates that further examination for utilities is essential?

The situation that indicates further examination for utilities being essential typically corresponds to potential hazards or complexity in the work environment, particularly when heavy machinery is involved. In the context of utility work and excavations, Stage 3 usually signifies a heightened risk due to factors such as known utility lines in the vicinity or challenges presented by the terrain. At this stage, it's crucial to conduct a thorough examination to avoid accidental utility strikes that could result in serious injury, service interruptions, or costly repairs.

Investing time in further examination at this stage is vital for safety since the presence of utilities can complicate operations significantly. This ensures that operators remain aware of potential hazards and can plan their work accordingly. In contrast, earlier stages — such as Stage 1 and Stage 2 — might indicate situations where utilities are less of a concern, while Stage 4 may involve scenarios where further examination might not be necessary due to established safety protocols or lack of utilities in the area.