Today is Sunday, 2021-04-18
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For us, the relevant section is:
❝Section 9 (“hand microphone” is defined in section 3(2)):
9 A person may use a hand microphone while driving or operating a motor vehicle on a highway if
(a) the device is within easy reach of the driver’s seat, and
(b) is securely fixed to the motor vehicle or worn securely on the person’s body in a manner that does not obstruct the person’s view of the front or sides of the motor vehicle or interfere with the safety or operating equipment of the motor vehicle.❞
RAC also has a summary of the law in different provinces.