People affected by color blindness do see a difference between the little green man who is walking and the red man who waits to turn green. Maybe the difference is not the same difference as you can see it, but there is a difference.
For my colorblind eyes the first and the second pictures are similar and the third is almost the same again. Only the last one is definitely different. It looks more like a grayscale picture to me.
The photographs are shown in the following order: Normal – Protanopia – Deuteranopia – Tritanopia. Choose the one which is most suitable to you.