Have had the HM for about a month, and have gotten the usual reactions: oncoming cars who flash their lights at me, or people who pull over, or an occasional driver who motions me to come along side, and says something like, "your lights are flashing." But last week I pulled up behind a 4-wheeler stopped for a light. When it turned green, he went about 1/2 block and stopped in the street! (We were on a city street with 4 lanes plus center turn lane and because of traffic, I couldn't go around him.) I had no idea why he stopped, but it soon became obvious when he got out of the car and started walking towards me, reaching for his billfold which persumably contained his driver's license. Meanwhile, I was watching the traffic in the inner lane plus those who were stopped behind me, just in case someone would attempt something dumb. I motioned for him to go on, but he didn't understand. Finally, when he got close enough to hear me say "headlight modulator," then I think he saw his mistake, smiled (probably relieved!), walked back to his car & moved on. I didn't think I looked like a Law Enforcement Officer, but then, what do I know?