Drive-Steer Car This mechanism is based on the adder-subtractors of Leo and Alex . It must be driven by two motors; one connected to one of the four gears on one side, and the other connected to one of the three gears on the other side. One motor makes the wheels move in the same direction. The other sterrs by making the wheels move in opposite direction. My design is acccording to me stronger than the other ones. Here are some more pictures Comments to: markov@cs.uu.nl