obstruction signal button

例句：

1. 1. The obstruction signal button is used to preventthe vehicle from moving forward.
   障碍信号按钮用于防止车辆前进。
2. 2. The driver pressed the obstruction signal button to alert the otherdrivers.
   司机按下了障碍信号按钮来警告其他驾驶员。
3. 3. The obstruction signal buttonwas designed to help drivers avoid accidents causedby obstacles.
   障碍信号按钮被设计来帮助驾驶员避免由障碍物引起的事故。