1. the Horn is vital to reduce accidents.2. take a very long time to develop a sound the Horn.3. to reduce the sound of silent movies, so as not to interfere with riding.4. normally, you expect to hear a car coming.5. Add an alert tone experiment via foot6. the system automatically when the car is at low speed than 16 miles per hour.7.19 miles per hour wheel it sound the way a person walks, then turn off the sound.8. There are no industry standards.9. There is a national highway, this isn't law using voice notifications that truck.10. inside the vehicle to minimize interference with sound wave.11.QNX has developed the nearby microphone system to send through the rear speakers.
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