If an oncoming car came along with lights that dazzled you you would flash them wouldn't you to let them know theres a problem, I dont receive any flashes from oncoming traffic, so I take it to mean that there's nothing untoward with my lights, besides that, I have asked friends and family if they are too bright when passing or I'm behind them and they say no, it could be something to do with the beam definition on my lights as they are plastic March items, they might react differently with British glass lenses.