Who can put an accident sign up?

谁有权设置事故警示牌？

阅读相关知识

Travel at 20 km/h or less until past the site. The sign does not establish a fixed distance to the crash.

看到这种警示应以每小时20公里或更低速度行驶，直到驶过现场；不能仅凭该牌推断固定设置在几百米外。