speedlimiting switch

例句：

1. 1.The speed limit is reduced to 50 miles per hour on this stretch of highway.
   这段高速公路的速度限制降到了每小时50英里。
2. 2.The speed limiting switch was installed to prevent accidents caused by reckless driving.
   安装限速开关是为了预防因鲁莽驾驶导致的事故。
3. 3. The driver had to pull over and check the speed limiting switch before proceeding.
   司机不得不停车检查限速开关后才能继续行驶。