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The Visual Approach Slope Indicator (VASI) is a system of lights on the side of a runway that provide visual descent guidance information during the approach to a runway.
This is the most common type of VASI system.
These work in about the same way as VASIs but allow more accuracy in that they can show how far off the glide slope the aircraft is. Two white lights next to two red lights shows that the plane is right on the glide slope.
VASI installations may consist of either 2, 4, 6, 12, or 16 light units arranged in bars referred to as near, middle, and far bars.
The basic principle of the VASI is that of color differentiation between red and white.
Since the tri-color VASI consists of a single light source which could possibly be confused with other light sources, pilots should exercise care to properly locate and identify the light signal.
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