1. The distance between road cones can be longer in the daytime; At night, it must be placed at the beginning, no more than 1 meter, no less than 5.
2. In order to prevent vehicles from crossing the operation control area, the spacing between adjacent road cones should not be more than 5m.
3. The road cones at the entrance and exit should be placed relatively closely, with a spacing of 1m, and a spacing of 15m in the construction area.