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?
According to the Hurt report is was determined that 77% of motorcycle accident hazards come from in front of the rider, while only 3% approach from the rear. What's interesting here is that motorcycle pipes direct the vast majority of sound backwards where the least danger is, so for loud pipes to be truly effective safety measures they would need to be pointed forward where the greatest danger lies. That doesn't do much to support the proposition that loud pipes are a safely factor. The other serious problem I have with this supposition is that it is, at best, a secondary safety measure, not a primary or proactive measure. Assuming that the other driver will act with caution once you have identified your presence by the sound of your bike roaring up from behind is foolhardy at best. That's like assuming that if you were to wear a bright yellow safety vest, or full riding gear, you can relax because now you're protected! Lets face it, the best protection you have is that 3 pounds of grey matter between your ears, that and a constant awareness of your surrounding, and acting on the supposition that the rest of the motorists in the world are all idiots and its up to you and you alone to ensure your safety on the road. Relying on the other guy to act reasonably or safely just because you're making more noise than those around you is just asking for trouble!
Interestingly enough too, I found that most motorcyclists with louder than stock pipes, interviewed in the various articles I read on the subject admitted that is was mostly a macho thing. They simply liked the sound of a deep-throated exhaust note, it added to the pleasure of the machine for them, very few made any mention of the "safety" issue. So it would seem the true believers in the LPSL crowd are in the vast minority, it may make a great tee shirt slogan, but is ability to hold water is about equal to that of the tee shirt it's printed on.
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