What is the primary concern when working near existing gas lines?

The primary concern when working near existing gas lines is preventing accidental rupture or leaks. This concern is critical because gas lines transport flammable and potentially hazardous substances. Any unintentional damage to these lines can lead to significant safety risks, including explosions or leaks that may pose threats to both workers and the general public.

When working in the vicinity of gas lines, it is vital to follow all safety protocols, such as ensuring proper separation distances, using appropriate marking techniques, and employing non-intrusive methods when excavating. Awareness and caution help to mitigate any risks associated with gas leaks that could arise from the pressure within the lines or the physical disruption to their integrity.

The other choices, while they touch on important safety principles, do not address the most pressing issue directly related to immediately preventing dangerous incidents.