![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgl7NFi3Mgek0FzeMV5uu2YKHZsCnmPpgS4dUxb8aWn3M4Rf7n42ldOUVVI0GNcbWjJtM4S199HZd-OEK_MO2FCnDlzuetdVlLzgPu3dG7NiOoYPS9_L4C2h1bo6LinjAsLAD4jP59q93s/s1600/Traffic_Light's_(6350967448).jpg)
Photo Attribution: Helgi Halldórsson
From Susanne Tak and Alexander Toet comes "Color and Uncertainty: It is not always Black and White" which finds that:
'A 'traffic light' configuration (with red and green at the endpoints and either yellow or orange in themiddle) communicates uncertainty most intuitively. '
A video presentation is also online.
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