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The Kōreisha mark (高齢者マーク, elderly car mark) is a statutory sign that is set up in the Road Traffic Law of Japan to indicate "aged person at the wheel". Its official name is "aged driver sign" (高齢運転者標識, kōrei untensha hyōshiki).
The law decrees that when a person who is aged 70 and over drives a car and if their old age could affect the driving, they should endeavor to display this mark on both the front and rear of the car. Drivers aged 75 and over are obliged to display the mark.
Conversely, the green and yellow shoshinsha mark (also called wakaba mark) denotes new drivers. Both marks are designed to warn other drivers that the marked driver is not very skilled, either due to inexperience or old age.