单选题 · 选择一个答案
When must you signal that you are turning to the right?
什么情况下向右转的时候必须打右转向灯？
Signal right for at least three seconds before a right turn.
右转前至少提前3秒打右转向灯。
阅读相关知识
Signal even when other traffic is not visible. Check mirrors, blind spots and give-way requirements; signalling gives no priority.
暂时看不到其他车辆也应示意，并检查后视镜、盲点及让行条件；打灯本身不赋予优先权。