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MUTCD R22-2: TURN OFF 2-WAY RADIO AND CELL PHONE Sign

The R22-2 sign is covered in Section 6G.11 of the Manual on Uniform Traffic Control Devices, 11th Edition. Below are the provisions from that section that describe when the sign is used and how it is placed.

What it means and when it is used

Standard · Required (shall)
The TURN OFF 2-WAY RADIO AND CELL PHONE (R22-2) sign (see Figure 6G-1 ) shall be used to require road users to turn off mobile radio transmitters and cellular telephones where blasting operations occur.
Support · Information
Section 6H.25 contains information about the full sequence of signs for blasting zones and the specific requirements for location of this regulatory sign.

Where to read the rest

Full text: MUTCD Section 6G.11: TURN OFF 2-WAY RADIO AND CELL PHONE Sign
Mounting height, lateral offset and retroreflectivity for any sign: MUTCD sign placement guide

Source: Manual on Uniform Traffic Control Devices, 11th Edition (Federal Highway Administration, December 2023, public domain). Excerpts are shortened and shown out of context; read the full section before specifying a sign. Your state may still be operating under the 2009 edition or a state supplement. Official manual: mutcd.fhwa.dot.gov.