Longitudinal buffer space separates approaching traffic from the ______.

Longitudinal buffer space is an important component of temporary traffic control setups, especially in work zones. It refers to the area between the moving traffic and the work space where construction or maintenance activities are taking place. This buffer serves to provide a protective zone that enhances safety for both the workers present in the work space and the traveling public.

In this context, the correct answer emphasizes the role of the longitudinal buffer space in limiting the direct interaction between moving traffic and the work activities. By maintaining this separation, it reduces the risk of accidents and provides a greater level of safety for everyone involved.

The other options do not accurately identify what the longitudinal buffer space protects against. Traffic space refers to the area in which vehicles operate, while the activity area typically pertains to regions where specific tasks are conducted within the work zone. A safety zone might involve a separate pedestrian protection area, but it does not specifically denote the space between traffic and the work activities. Thus, the choice that correctly identifies the role of the longitudinal buffer space is the separation from the work space.