I mounted a rechargeable flashing warning light on mine after someone almost rear ended me. It's been a game changer. Haven't had a "near miss" since. You get these on Amazon and then I just used an "L" bracket I already had. With this, I feel confident I am as safe as a normal bike. I still use a flag but feel they help more with people coming from you left or right at a 4 way stop, for example. YouTube link is below.
