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hertz.That means deer can hear sounds well above what people can sense. For her experiments,Mary found a clearing,a small field where she set up a speaker and a remote control.When it sent out a 14,000-hertz sound,it didn't frighten the deer away.She increased the sound gradually,and when the speaker broadcast 25,000 hertz,the deer just walked away. The teen expects her warning "whistle"to be broadcast from speakers along the sides of a highway.These will warn the deer to stay away-even when there is no car in sight."It's like a stoplight for animals,she says.That way it may keep deer off the road.