Visual approach slope indicator

Rarity: Common

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At a glance

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Notion

Domain

Science and technology

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What Wikipedia says

The visual approach slope indicator (VASI) is a system of lights on the side of an airport runway threshold that provides visual descent guidance information during final approach. These lights may be visible from up to 8 kilometres (5.0 mi) during the day and up to 32 kilometres (20 mi) or more at night.

Excerpt from the Wikipedia article “Visual approach slope indicator”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Stephenmshields, CC BY-SA 4.0, via Wikimedia Commons.