The modulator flashes the headlight much faster than you could by hand, and you can see it from a long way back. They are very common around here, and most everybody knows what they are. But like I said, there are a few cagers that are going to do their best to nail you no matter what you do, so while I believe in high visibility, I still have to assume I'm invisible. But I have had fewer close calls than when I used to wear all black. A rider dressed in black on a mostly black bike is all but invisible to pretty much everyone. Jerry.