public boolean moveForward(float tpf) {
        if (this.getLocalTranslation().z > -11f) {//Drive with speed of 3 becouse crane is not loaded
            this.move(0, 0, -tpf * (20 / 3.6f / 3) ); // (20 km/h) / (3.6 = m/s) / 3 our scale
            return false;
        } else  // return true if Crane reached its destenation
            return true;
    }