如果你要直行通过一个环形交通岛，不要在接近交通岛时发出信号，只在你要行驶的出口前一个出口处发出左转信号。正确还是错误？If you are going straight through a roundabout, don't signal as you come up to the roundabout, only signal left as you pass the exit before the one you wish to take. True or false?