What ballasting rule applies to channelizing devices (cones, drums, barricades) to prevent them from becoming flying hazards when struck?

1. Sandbags must be placed on the base or low rails, never on top.
2. Heavy concrete rocks should be stuffed inside hollow cone tops.
3. Sandbags should be tied with ropes to the top rails of barricades.
4. Steel rebar stakes must be driven through cone bases into asphalt.