Pavlinka has built a car able to transport tigers and to follow the line. Her car steers using ONE motor. To build the car, she modified the steering mechanism by Yoshihito Isogawa. The program is based on the fact that the motion sensor is able to measure the reflected light intensity similarly as the Lego Mindstorms colour sensor. Enjoy the video!
You can also see the video on youtube: https://youtu.be/qJq9qxOAjsA