宜蘭縣道路安全大使路昊誌/宜蘭報導
現代人出門無論是騎踏車、坐摩托車、開車、就連走路,只要來到路口第一件事就是會遇到路口的交通號誌,而這號誌有單獨的閃紅燈或黃燈,不然就是「紅、綠」燈,而紅綠燈卻有紅、黃、綠等3號顏色,為什麼?現在就由宜蘭縣道路安全大使「路昊誌」來為您報導!
「紅綠燈冷知識」:為什麼紅綠燈是紅、黃、綠三種顏色?
人的視網膜含有杆狀和三種錐狀感光細胞,杆狀細胞對黃光特別敏感,而三種錐狀感光細胞分別對紅光、綠光和藍光最敏感,因為眼睛對藍光敏感的感光細胞較少,所以紅光、綠光作為分辨顏色較佳。
光學原理:
- 紅色光的波長很長,穿透空氣的能力最強,更容易被察覺,所以作為禁止通行的信號。
- 黃色光的波長較長,穿透空氣的能力較強,所以作為警告的信號。
- 採用綠色作為通告信號,是因為紅色和綠色的區別最大,易於分辨,其顯示距離也較遠。
宜蘭縣政府提醒您:請遵守交通號誌規則,路口慢看停,行人停看聽!

為什麼紅綠燈是紅、黃、綠三種顏色?

為什麼紅綠燈是紅、黃、綠三種顏色?
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