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When riders talk to each other, the front ones have to turn their heads back in order to listen to or speak to another rider clearly. This small action is often blamed for causing serious traffic accidents.
To solve the problem, we design a new helmet. Unlike those with build-in electrical devices, this helmet is just modified by some mechanical improvements. There are sound holes by the lower-front as well as the lower-back sides, which connect by channels inside the casing. Voices are directly delivered through the channels rather than via the outside air. As a result, people wearing the helmet can have conversations safely afterwards.