All credit goes to Scott Stevenson. I only modified this a bit to make it more functional.

Check out his site here: https://scott.stevensononthe.net/2016/01/rainmeter-google-traffic-estimation-skin/

Also, this skin goes great with "Sphynx Traffic". You can find it on DeviantArt, here: http://moshiab.deviantart.com/art/Sphynx-Traffic-586819325