What must an air traffic controller omit when issuing LUAW instructions if visibility is clear?

When issuing LUAW (Line Up and Wait) instructions in clear visibility conditions, an air traffic controller may omit traffic updates because the visibility allows pilots to visually acquire and identify other aircraft that may be in the vicinity. In clear weather, pilots are generally more capable of seeing potential traffic without needing frequent updates from air traffic control. This allows controllers to streamline communications and focus on essential instructions without overwhelming pilots with information that can be seen directly.

While safety concerns and clearance information are critical components of an air traffic controller's responsibilities, omitting traffic updates in good visibility can enhance operational efficiency without compromising safety since pilots can monitor their environment effectively. Therefore, when visibility is clear, omitting these updates is a practical decision.