93(1)Where material is piled along the sides of any excavation or trench and interferes with the flow of vehicular traffic, an employer shall ensure that the material is adequately illuminated by warning lights or reflective materials.

93(2)Where work is being carried out and interferes with the flow of vehicular traffic, an employer shall ensure that adequate warning signs are posted in both directions as indicated in the following table and at any intersection between the warning sign and the work area: