A recent bike safety report from The League of American Bicyclists found that most fatal bike accidents originate from something behind the rider. While being visible is certainly much of the battle to stay alive and pedaling, it's also about knowing the dangers behind you so you can evade. (Growing up, my dad always said, "Assume that the cars can't see you," and he was right.)
But in certain situations, it can be tricky to know exactly what and when to evade. Say, on a loud city street or when a silent-but-deadly Prius sneaks up on a country road. Looking to make you—and the driver—aware of your shared proximity, Backtracker turns to some cool radar technology.
Mounted on the back of the bike, radar sensors can detect potential killing machines up to 160 meters away, alerting the rider of their presence using a nifty, handlebar-mounted gizmo.