by 
Bartman
ANSWERS: 3
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i would imagine that shape makes them more stable so they won't fall over. :]
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Most warning signs, objects, have a distinct shape to make them easily recognized. The flourescent cone is less likely to be mistaken for something else. They are also a stable shape and less likely to be blown over in a wind storm.
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The inventor, Charles P Rudabaker, came up with the idea when he saw soccer players using class dunce caps as markers on their playing field. He made his original traffic cones out of concrete, but they were modified into the rubber and plastic cones we know today, because they didn't last long in traffic, and were dangerous to wayward cars.
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