isual light ules. Navigating and avoiding other aircraft by visual references rather than instruments. (see IFR)
Rules that govern the procedures for conducting flight in visual conditions. The term "VFR" is also used to indicate weather conditions that comply with specified VFR requirements.
visual flight rules
Visual flight rule. There are two ways to fly aircraft: by VFR, based on vision; and by instrument flight rule, or IFR, based on information from instruments (as done by aircraft at nighttime). Hot air balloons are always required to fly by VFR. W w