Koreisha mark
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The Koreisha mark (高齢者マーク) is an orange and yellow teardrop-shaped statutory sign that is set up in the Road Traffic Law of Japan to indicate "aged person at the wheel". Its official name is the aged drivers' sign (高齢運転者標識, kōrei untensha hyōshiki). It also called momiji mark (紅葉マーク, autumn leaf mark). Some people call it kareha mark (枯れ葉マーク, dried leaf mark) or Ochiba mark (落葉マーク, fallen leaf mark), but they are not pleasant words.
The law decrees that when a person who is aged 70 and over drives a car and if his/her old age could affect the driving, he/she should endeavor to display this mark on both the front side and the rear side of the car. Drivers aged 75 and over is obliged to display the mark.
Conversely, the green and yellow shoshinsha mark or 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.