Towards the bottom of the article is a picture titled "The road to a better, better parking sign" that shows various iterations of the design. It isn't very cle

Towards the bottom of the article is a picture titled "The road to a better, better parking sign" that shows various iterations of the design. It isn't very clear, but if you look closely at the two iterations on the right there are stripes added to the red specifically for color blind. It's more clear on the designers blog: http://toparkornottopark.com/tagged/evolution http://toparkornottopark.com/tagged/evolution