Road rides put traffic behind the rider, and the SeeMee R300 Rear Light is a radar rear bike light that senses approaching vehicles up to about 459 feet back. It relays visual alerts to a compatible cycling computer, and the detection area reaches around bends. The light switches itself off after 5 minutes of inactivity and wakes again with any vibration, so it is ready when the bike rolls. What Our Gearhead(R) Experts Are Saying:"On winding road rides, the alert appeared on my cycling computer before a car came into view around the bend. I checked the screen, held my line, and let it pass."