Not quite a form, but the U.S. govt. has worked on optimizing the typeface for road signs for legibility - see http://www.nytimes.com/2007/08/12/magazine/12fon

Not quite a form, but the U.S. govt. has worked on optimizing the typeface for road signs for legibility - see http://www.nytimes.com/2007/08/12/magazine/12fonts-t.html http://www.nytimes.com/2007/08/12/magazine/12fonts-t.html