public String toString() {
        
        String s1 = "";
        String s2 = "";
        
        for (int i = 0; i < theLane.length; i++) {
            if (theLane[i].getLight() != null)
                s1 += theLane[i].getLight().isGreen() ? "G" : "R";          
	    else
                s1 += "";
            s2 += theLane[i].getCurrentCar() == null ? "-" : "@";
	}

	    return s1 + "" + s2 + "";	 	
 
    }