黄灯红灯绿灯都亮着，看到这样的交通指示灯,  该停下还是前行?

what shall i do when see such lights?  stop or go ahead?

有谁注意过红绿灯的排列次序? what's the proper position of the three lights? 

红,黄,绿从上到下, 还是反之; red, yellow, green top down or vice versa;

左右排列时又是怎么个次序? and what's about if left to right or vice versa?

国家是否有统一的规定方便色盲的人 ...