[QUOTE] No, it the Road Vehicle & Lighting Regulations, No.27 "You MUST NOT: Use any lights in a way which would dazzle or cause discomfort to other road users."[/QUOTE] The way you wrote it, I wondered. There's a lot of drivers/riders out there who've never/rarely had to use main beam and wouldn't know what to do on an unlit road. They probably think it's purely a signalling device. [QUOTE] You can however, flash your lights as a warning to other roads users that you are approaching, sort of the night time equivalent of sounding the horn. What you're *not* supposed to do is use them to tell people, "Yes, you can pull out", as flashing the lights is intended to mean the opposite (fuck off, I'm coming through...)[/QUOTE] That's when it gets sticky, I agree. Misinterpreting flashes has led to collisions in the past, but for the most part, flashes tend to be interpreted correctly in the context in which they occur. [QUOTE] Highway code, reg.90 "Flashing headlights. Only flash your headlights to let other road users know that you are there. Do not flash your headlights in an attempt to intimidate other road users."[/QUOTE] "She flashed her norks at me and I crashed."