In a flash of helpful creativity, the Highway Safety people in Washington deemed it necessary to mandate that all new street signs be in upper and lower case to "make them more readable" because "studies showed" that words with both upper and lower case "were easier to read" (Even if the letters are made smaller to accommodate this new style?)
The problem is that with this mandate, the street signs are not being replaced with larger signs to allow for larger letters, and the result is a stylish sign that is now harder to read. This mandate by the way, comes at a time when cities and states are broke, or fast running out of money. And the new sign mandate comes at no small cost. All because a committee of "experts" suggested this style change to a government agency. And the agency ran with the new idea.
Maybe someone at the Highway Safety Administration thought that ALL CAPS street signs was SHOUTING and of course, we couldn't have that.