Found this via twitter on cool hunting.. i need to get one.
Make your own bike lane
A few months ago the LightLane personal bike path was merely a competition entry in conceptual phase. Using high powered laser beams mounted to bicycle seat posts, the light generated so much interest that the designers took it into development.
Alex Tee, a mechanical engineer, and industrial designer Evan Gant, who both work with the Boston-based design firm Altitude, Inc. are currently in the production engineering phase of development. The proposed LightLane model uses two high-visibility DPSS (diode-pumped solid state) green lasers mounted alongside traditional bright red LEDs to crisply mark a broad path on the pavement.
Check out more at http://www.lightlanebike.com/
Too bad that won’t be nearly as effective during the day, if so I’d get one for sure.