I had the unenviable pleasure of taking my MiL, an 11 mile route taking in both town and country driving. While on an unlit section of country road I was behind another car, probably c. 150-200 meters and suddenly I saw a cyclist ahead. No problem as there was time to move out the way and give plenty of clearance while passing, but I saw him later than I would have liked. The road wasn't straight with a few curves and I think that I confused his rear light with that of the car in front. He had a constant rear light and not one that automatically says cyclist / one similar in tone to a car rear light at a bit of distance. This got me thinking about rear lights and whether or not I would have seen him earlier if he had had a flashing rear light or on that couldn't be mistaken for anything other than a bike light. I wanted to as the wisdom of CC whether they have their rear lights se to constant or to flash and whether or not you use instantly distinguishable lights? While this cyclist had his rear light on he wasn't as visible as I would want to have been in his circumstances.