Would it make a difference?

[classic33]

http://www.kickstarter.com/projects/euanmackenzie/velocitylight-the-intelligent-speedometer-bike-lig
The VelocityLight:

• differentiates you immediately as a cyclist in the visual noise of the traffic

• It shows your speed of travel, making drivers re-assess their rate of approach

• It works as a brake light, getting increasingly brighter as you slow down.

• As a stand alone rear light, the VeloCityLight is one of the brightest rear lights available on the market – 48 LEDs giving out between 20 to 175 lumens.

 

[Pro Tour Punditry]

Looks like a "solution" looking for a problem

 

[ianrauk]

Already being discussed at length HERE.
So will close this one.