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 are obliged to display the mark.
Conversely, the green and yellow shoshinsha 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.