Which quotation supports the idea that sign shapes and colors communicate
meaningful information to drivers?
"in the early 1920s, representatives from wisconsin, minnesota, and
indiana toured several states with the intent of developing a basis for
uniform signs and road markings." (paragraph 4)
*their efforts resulted in standards for sign shapes, some of which are
still in use as we enter the 21st century." (paragraph 4)
"for example, round signs warned of approaching railroad crossings
which even then represented the most potential danger to the driver
(paragraph 5)
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"all signs were black letters on white background and were limited to 2!
feet (0.6 m) square-that was the maximum width of sign-making
equipment." (paragraph 5)