$13 buys a handlebar-mounted rear view mirror, with free two-day shipping. Works great. I got used to having a rear-view mirror while riding a motorized scooter. Couldn’t imaging riding a bicycle without it. This one is rock-solid steady. It doesn’t move unless you intentionally adjust it. It wouldn’t work on the racing-style handlebars in Mr. Haughey’s photo, but I’m pretty sure you can get mirrors that will.