This is an update of the RCX rack-and-pinion steering car. The back wheels are driven by one motor. A motor in the front allows for steering using a rack-and-pinion steering mechanism. An ultrasonic sensor in the front detects whether the car is near a wall. If so, the car will back up and start driving in another direction. This car was designed in February 2007. This robot is also featured in Building Robots with LEGO Mindstorms NXT.
