Fig. 5. Direction of travel and relative direction of forces measured for the Brinkman Traffic Simulator and the Cady Traffic Simulator. (A) Top view of the Cady Traffic Simulator. The directions of travel are shown along with the directions of the measured forces. (B) Direction of forces for the various feet when operated in the forward direction. (C) Direction of the forces of the various feet when operated in the reverse direction. (D) Side view of the Brinkman Traffic Simulator showing the directions of the front/back forces applied by the rollers.