The other day I riding along and I saw a guy in broad daylight, clad from head to toe in high-viz, three ultra-bright headlights and two flashing ultra-bright helmet lights! He looked a bit like a big luminous yellow christmas tree ... my first thought was, "I've heard of high-viz, but you are something else!" I'm also thinking that too much high viz turns you from being something to avoid to being something for some (idiotic) drivers to target ... So where do you personally draw the line at being high-viz? For me it's a white t-shirt during the day (apparently the eye is drawn to large blocks of white - hence why they say motorbike riders should go for white helmets) and a pair of front and rear super-bright LED lights which go on at night. I think that's adequate!