176(1)Where a blasting operation by an electric means of initiation is about to commence and while it is in progress, an employer shall ensure that signs bearing the words “Blasting Operations - Turn Off Radio Transmitters” and “Opérations de sautage - éteindre les émetteurs radio” in letters of luminous paint not less than 150 mm high on a contrasting background are posted on all roads within 100 m of the blasting area.