STOP. KEEP RIGHT. NO U-TURN. The signs along U.S. highways seem to speak in a stern and unalterable language of command. But the fact is that they are constantly subject to testing and revision; and now, after more than six years of psychological and engineering research, the U.S. Department of Transportation is unveiling a whole new set of them. Some of the new signs are already up, but three years will pass before all of them are installed.
The basic idea is to make traffic signs pictorial rather than just verbal. Drivers react more quickly to pictures than to words.
So the U.S....
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