Have to agree that this is something most car drivers would not see for what they were. I bought a back light recently that has a couple of 'Laser' lights that shine down on the road surface so that I have a red line from around the crank to six or seven feet behind me on both sides. They are amazingly bright and create a so called 'Safe Cycle Lane'. Similar to the product above, the packaging shows this on a dark road and it does work. That is until a car with headlights comes up behind you then the red lines just get overpowered by the car lights. So, great if you are riding along dark roads with another cyclist behind you with no lights on.