Traffic lights are almost greatPosted: October 31, 2011
They come with one major catch, though, which usually gets forgotten. About 7% of men are red/green colourblind. To them, a traffic light looks more like this:
and red and green bits of the dashboard are indistinguishable.
What to do?
I’ve never solved this to my satisfaction. Most of the time I use pattern as well as colour – e.g. red lines are dashed while green are solid. This is a bit of a hack, and doesn’t have the same easy accessibility or the same emotional impact for dashboard users as red/green does.
I’d love a better solution. If you have ideas, please let me know in the comments.