Cum s-a ales forma semnului „STOP”. De ce este singurul indicator rutier octogonal

The 'STOP' sign, recognized globally, has an octagonal shape chosen for safety reasons. Initially introduced in 1915, early signs varied in design and color. In 1923, the octagonal shape was standardized to enhance visibility and recognition. Originally yellow, the signs became red in 1954 to align with traffic signals. By the 1960s, the octagonal red sign was adopted internationally, although some countries like Japan use different shapes. The unique shape aids in recognition even when obscured, emphasizing its importance over the text.