Heads-up GPS for cyclists

Cyborg-style heads-up displays have always had a place in our techy visions of the future, but it's nice to finally see a practical application in development for the forseeable future. The ARider is a Japanese prototype which will utilise the iPhone for it's GPS. No doubt there are potential safety concerns about such a device, let's face it, it's dangerous enough cycling through heavy traffic in London with your attention entirely on the road, without dividing your attention with a small digital screen. Still, it's thought-provoking, I believe it's simply a matter of developing the interface and definately tieing-in stronger audio cues for the video display.