Whether it is a modern ocean ship or a trailer,the speed of the host is an indispensable parameter when running.And it will be equipped with a host speed protection device.The speed sensor is used as an element that collects the speed signal of the host,which plays a vital role in the speed control and speed protection parking of the host.Even severe machine damage occurs.This article takes 16 rounds of dragging for 16 rounds as an example.It briefly introduces the failure of speeding parking and emergency treatment methods during the operation,and provides ideas for the emergency response scheme of such host-speed parking incidents such as the trailer.