警示牌上写着“危险：前有滚石”。

The sign said 'Danger: falling rocks'.

在确认安全的情况下让车速缓缓下降，停稳后在车后方竖立危险警示牌，立即更换备胎。

In confirmation of the security situation, make speed slowly in the rear car stopped up after them, replaced immediately danger spare tire.

遗憾的是，这句用黑色签字笔涂写的指示，是一名游客违背警示的涂鸦。他在塑料警示牌正下方写下了同样的话，为的是嘲讽这个标牌。

Unfortunately, the instruction, scrawled in black marker, was the defiant graffiti of a visitor who had decided to mock the plastic sign just above it by saying the same thing.