What is the fast-moving car-like equipment next to the sprint runway?

The 2006 Shanghai International Track and Field Golden Grand Prix will start tomorrow. In addition to gathering many international track and field stars, this competition also adopted the latest technical equipment-"electronic rabbit", which is a special camera equipment. From the athlete to the finish line, this device can synchronously photograph the competition process by remotely controlling the moving speed of the "electronic rabbit". In this competition,100m hurdles,100m hurdles and110m hurdles in which Liu Xiang participated will all use "electronic rabbits". I'm afraid no one can see the battle between Liu Xiang and Johnson better than this "rabbit". This is also the first time that "Electronic Rabbit" has appeared in Asia.