visual flight rule

…flight control is called the visual flight rule, in which pilots fly with visual ground reference and a “see and be seen” flight rule. In congested airspace all pilots must obey the instrument flight rule; that is, they must depend principally on the information provided by the plane’s instruments for…

…and aircraft can operate under visual flight rules (VFR), operational capacity increases from the lowest level, crossed runways, through the closed V and open V configurations. However, in poor visibility or under certain conditions of very heavy air traffic, aircraft must operate under the strict instructions and rules of air…