public void steer(float value) {
        for (int i = 0; i < wheels.size(); i++) {
            if (getWheel(i).isFrontWheel()) {
                vehicle.setSteeringValue(value, i);
            }
        }
    }
Set the given steering value to all front wheels (0 = forward)
@param value the steering angle of the front wheels (Pi = 360deg)
jme3-jbullet/src/main/java/com/jme3/bullet/objects/PhysicsVehicle.java