Traffic engineers, either lacking in ingenuity or a work ethic, scurried off with this system of color coding, and instituted the very first electric stoplight in Cleveland, Ohio in 1914.

• 而交通管理工程技术人员有些由于缺乏机灵，有些缺少职业道德而匆匆离开这一岗位。这种交通信号灯编码系统于1914年在俄亥俄州的克利夫兰市首次实行。