Exactly. As far as I've been able to tell, mere noise will do absolutely nothing to get most drivers' attention. I've seen drivers fail to notice a police car o

Exactly. As far as I've been able to tell, mere noise will do absolutely nothing to get most drivers' attention. I've seen drivers fail to notice a police car or other emergency vehicle behind them, siren and lights both on, as they stare fixedly at the phone in their lap. Even in less extreme cases, most drivers will just treat loud motorcycle noise as part of the general din of being in a place where they exist. It won't generally have any effect at all on their decisions to speed up, slow down, or change lanes. Fun fact: the more common a noise is, the less likely it becomes that it will have any effect at all on people's behavior.