Road biking is an inherently dangerous sport, and too often we hear about cyclists getting hit by cars. The Blaze Laserlight aims to fix that problem.

The laser projects a bright green symbol about 15 feet in front of the rider, which hopefully helps keep oblivious drivers from turning into the bike.
The sleek light is rechargeable, USB-compatible, and waterproof. The light projects in flashing, low, and high modes, and won’t turn on (and run down the battery) unless it’s connected to the bike.
$200, blaze.cc