To survive out there among the "cagers", we have to assume we're invisible while at the same time making ourselves, and our bikes, as conspicuous as reasonable. Many commuters and sport-tourers know the value of adding retro-reflective materials to both motorcycle and rider. Originally developed for sea-going folks, SOLAS (Safety Of Life At Sea) tape is the most "reflective-y" material I've found, seemingly bouncing back more light than hits it. It's the most expensive as well -- you can buy it in bulk from industrial suppliers (like this one) for a fraction of what motorcycle product vendors want for it, and then share the excess with your riding buddies.