Stopping for fellow riders that look like they might have broken down is also a nice custom. Unfortunately my last two attempts were failures/misdiagnostics. One rider (Harley) had only pulled over to use his cell phone, and the other when getting closer turned out to actually be a highway patrol cop lasering people. I almost came to a stop on the interstate median when I finally realized my mistake, and what he was up to. Well, it's the intent that counts! And they should really be wearing high visibility stuff; from afar he looked like your typical underdressed biker (or overdressed Harley pilot)...