And smart riding.If loud pipes save lives. Then quiet bikes should be killers. Show me the numbers. Why are Wings and quiet little dual sports not in a lot more collisions?
Visual conspicuity saves lives.
It's hard to isolate the effect of noise. Wing riders are typically mature riders that have lots of miles in the saddle. You'd need to try to study SS or cruiser with stock pipe vs reasonable aftermarket vs ahole pipe. The hard part is finding enough stock pipes in the wild to be a reasonable control. I actually suspect that crash rate will be much higher on ahole piped bikes as typically those riders have a lot of risk factors (wanting attention, revbombing instead of manoeuvring around a hazard, riding like idiots).