Supporters of the idea seemed to consist for the most part of folks that either sold (loud) aftermarket pipes, or folks who road bikes with loud(er) aftermarket pipes. Yet these same folks could not provide any hard facts to back up their claim, the best they could come up with were rather vague statements about how if they make lots of noise "(car drivers) are sure as heck gonna hear me!" or claims that loud pipes give the other motorists ample warning of the approaching biker as they cruise up from behind. These statements seem to presuppose several assumptions that; 1) the other driver is not only going to hear the biker, but take the time to identify their actual location, 2) drivers in general rely on sound as much as vision to locate and avoid obstacles (in this case the motorcyclist), 3) the other driver gives enough of a damn about motorcyclists in the first place to do (1) and (2) above, and 4) that sounds emanating from a motorcycle's exhaust travel equally in all directions from the source.These seem, to me, to be a rather risky set of suppositions with little, if any, basis in fact. It is well documented that vision plays a much bigger role in operator safety than sound. Think about the last time you heard a siren, were you able to identify the location of the approaching vehicle by the sound alone or did you not in fact have to wait to make visual contact with it before you could precisely identify its location relative to you? Do proponents of loud pipes really believe that other motorists are going to concentrate on locating the approaching motorcycle and keep it in view till it is well past them and out of harms way? Where is the evidence to support such a claim? from a google search "loud pipes save lives"