Which two categories can highlines be classified into?

Highlines are classified into two categories based on their orientation and the way they are rigged relative to the ground. In this context, the correct classification involves distinguishing between horizontal and sloping highlines.

Horizontal highlines are set up in a level manner, allowing for movement along a straight path between two anchor points that are at a similar elevation. This type is often preferred for traversing across gaps or canyons.

Sloping highlines, on the other hand, are rigged at an angle, which is significant when needing to descend or ascend between points that are at varying heights. This category allows for flexibility in rescue scenarios, facilitating movement in both upward and downward trajectories.

Exploring the other options clarifies why they do not apply to the classification of highlines. Vertical or horizontal does not fit well because vertical lines refer to structures that go straight up and down rather than traversing between points like highlines do. Inclined or declined could refer to slopes but doesn't capture the standard terminology used in rescue scenarios. Lastly, linear or circular does not reflect the actual applications and configurations of highlines in technical rescue situations, as highlines typically do not take on a circular form.