All of the above! Each works complimentary to each other; in some conditions lights are most visible. some things work better at different times of day or with different weather conditions. For example, on an overcast day, reflectors won’t help unless it’s really dark/rainy and cars have their lights on. can’t hurt when it’s daytime and the weather is gray, but high visibility clothing (neon colors, not just light colors) is the best way to go for being seen. Reflectors won’t do anything for you unless cars have their lights on.