text: Nevertheless, hands-free devices. These machines allow people to talk on the phone while maintaining control over the vehicle, however, it can still be risky. Inquiries have shown that chatting with someone on the telephone forces the cerebellum into using most of its strength into the conversation. This indicates that a limited amount of the brain's focus is direct attention on operating the car. This could also determine a discussion with someone in the vehicle is highly threatening, so if this were to be combined with a poor response, it must be cope with an awkward hands-free earpiece to wear which can be inconvenience due to the static or wind, its just a serious disturbance.