If you use a backpack when you’re commuting, adding some reflective ribbon to your pack can help make you more visible.
On my backpack, I have two pieces of reflective/neon yellow ribbon. I fixed them to the pack in an X pattern. They’re about 16″ long, so about 7″ dangle below my pack and flap in the wind.
My theory behind this is that the flapping parts may attract a bit more attention because they’re flapping. I added three grommets to each strip. This makes it easy to attach to any pack with a couple of mini carabiners or plastic ties.
Cost for the ribbon was about $10.