Black, by far the most popular color for motorcyclists, isn't the worst possible color for a motorcyclist, but it's way down there. Olive drab, gray, camouflage patterns, and other dull colors are worse, but black doesn't jump out at all, and at night it is the worst choice. The best choices are those eye-catching colors in the red-to-yellow range, and they should be bright; a dull yellow is not as effective as a bright yellow. Fluorescent colors are best. I have even seen eye-catching fluorescent blue and green helmets. Finally, you want a big, uninterrupted section of that color. A complicated scheme of several bight colors is less effective than a continuous patch of a single bright color.