Earlier this year, we reported how the colorblind were blind to Google Maps traffic because many of them could not distinguish between the various shades of colors.
It has come to my attention from a Googler named Dave via the Google Maps Help forums that Google has made changes to some of the colors to help the colorblind distinguish between the various traffic colors.
We recently (last couple of weeks) made a change that was significantly driven by requests in this forum, to make the red (second-slowest level) a bit darker so it could better be distinguished from the green.
Dave from Google added that Google Maps is also "looking into other solutions."
This is pretty cool of Google to try to help the colorblind.