Anonymous

The only true noise would be an actual recording of an internal combustion engine that varies not only with speed but also throttle position. The noise also needs to gradually appear and disappear and not turn off and on from full volume to no volume at a certain speed. Any augmentation or supplementation is just adding noise pollution. I live in a neighborhood about 50' from an intersection with a lot of turning traffic, motorcycles, and trucks. I do not want to constantly hear augmented noise as cars adjust their speed. The true noise should be based on a relatively quite model of internal combustion engine with the same operating characteristics, unless we are going to augment the sound of internal combustion engines next if they do not exceed a certain decibel level. I also have concerns about the effect on parallel traffic, whether pedestrian, bicycle, or other automobiles as these warning sounds turn on and off with the surge in traffic speeds. This will also affect any background noise adaption, especially if the background noise sensor measures only a small section of the audible range. Will a motorcycle driving just above idle next to one of these cars turn the volume full up? Finally, I am disappointed that no discussion was included with the sound level tables emphasizing the logarithmic nature of the table. 60 decibels is not 20% louder than 50 decibels but 800% louder.