Tons of posts are here on headlight modulators, so I thought I would add mine. I have had a headlight modulator on my last 3 Goldwings. I am certain cagers are annoyed by my headlight modulator, more so when I am up close behind them at a traffic light, whereupon I turn it off. I also turn it off when riding in a group. If anyone who is driving can't see a group of bikes coming toward them we are all in deep trouble. Mine is wired to work with the high beams only, so I can dim my lights to kill it. Many people say they are afraid it will annoy cagers. I am sure some are annoyed at other times on the road too. If someone is at an intersection waiting for you to pass by why should you care if they are annoyed? It's way less than a minute out of their day. To me it's far more important for them to see me coming, so I leave it on most of the time. I only see them on 1 out of 300 to 500 motorcycles while riding or driving my truck. Common sense should tell us they are effective at making the cagers see us. I will never ride without one. Also I have been surprised for years why so few motorcycles have one. Some will say they don't work. Look down the road at oncoming traffic the next time you are out riding your bike or driving a car. There are always some cars that do not have their headlights on. Be honest with yourself and ask which ones do I see first? Keep in mind they are not blinking. A blinking headlight in my estimation may be up to 100 times more noticeable. Isn't being noticeable what we want while riding?