Why are the buoys red and green?

Buoys are colored red and green to indicate navigational channels and help mariners determine their position relative to safe passage. In the U.S. and many other countries, red buoys typically mark the right side of the channel when entering from the sea, while green buoys mark the left side. This color coding is part of the IALA (International Association of Lighthouse Authorities) buoyage system, which ensures consistency and safety in maritime navigation.