Clear as a choice for the go signal, varied slightly from the light cast from typical street lamps, or from the glare of the sunlight, and, thus could quite easily be mistaken for the go signal...after the fact.

• 用亮灯作为通行信号，其明亮的灯光跟一般街头的路灯差别不大，跟太阳光的闪烁差别也不大，路灯及太阳光都可能被误认为是通行信号。