In a blasting zone, radios and cell phones can interfere with the workers' airwaves and compromise the blasting activity. Post this sign in sequence with a Blasting Zone sign to avoid any complications.
Standard: 01 The TURN OFF 2-WAY RADIO AND CELL PHONE (W22-2) sign shall follow the BLASTING ZONE AHEAD sign and shall be placed at least 1,000 feet before the beginning of the blasting zone.
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