It may not be legal in most civilized nations to ride a Segway on the sidewalk, but for those still risking their lives on a two-wheeled machine, things are about to get a lot safer. SoundofMotion has developed a clever new warning system that turns your phone into what sounds like a roaring motorcycle, and not content with just playing a pre-recorded loop over and over, it's actually designed to rev up and down based on the speed and acceleration of your bicycle. The application will run on "any Bluetooth- and Java-capable phone," and it interacts with a "wireless BT sensor" that gets mounted on one of your wheels. Unsurprisingly, the device responds to the motion sensor and lets the carefree motorists around know you mean business when crossing an intersection. The app is currently sitting in beta, but the creators hope to have a final rendition ready to go before you make too many summer treks, but you better be willing to face total embarrassment (and have one loud speakerphone) to save your skin before picking this up. Click on through for a demonstration.