Read this sentence from chapter 8.“As I’m certain you are aware, the problem in the past with this new technology in automotive sound has been road vibrations interfering with an accurate dispersal of the phonic interpretations.” What does the word “accurate” mean as used in this sentence?

As far as I know vehicle traveling vibration is random. It means that there is no one exact frequency. Of course if there are not regular cavities in the road. The dominating frequency range on the body (sprung mass) is for passengers cars approx 1-2 Hz. This is because of suspension natural frequency. This range is well tolerated by the human body. That is why this range is chosen. But I am not the specialist so anyone can correct me at will. 

these have to be in your own words