To mark the launch of the new Asics store in london, an installation was created allowing you to race against other runners and the London Circle Line over 3 races, with times logged into a leaderboard. The main challenge was detecting how far the user had run on a treadmill and feed that into a Flash based app.
To solve this a cunning solution was used, a white stripe was painted onto the treadmill and a webcam was focused onto it. As the camera picked up passes of white and black the Flash app was able to work out the distance the runner had travelled!