Here’s how the rule reads: “A CMS should not be used to display a traffic safety campaign message if doing so could adversely affect respect for the sign. 11.Įver since, writers have generally been asking “Can’t they take a joke?” The new standard – described on of the 11th edition of the Manual on Uniform Traffic Control Devices for Streets and Highways – made the front page of The Wall Street Journalon Jan. It wasn’t considered funny when the feds told the states that their road signs can no longer be humorous. (Photo by Tony Webster of Minneapolis from Wikimedia Commons) A new federal rule calls for eliminating funny signs like this one, spotted in Minnesota.