You can outrun the sound your pipes are making. jut asked leo when they are moving fast. People dont hear you that are in front of you until you are on top of them. What you hear when you are sitting out having coffee etc., is the sound as it reaches your ears. If you are behind on to the side of the sound. I am not a sound expert but was a leo(retired) for 21 years and when we went to training the part that was about emergency driving they would explain the above information in more detail.
|