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(a) in the case of a motorcycle, there is displayed on a yellow fluorescent tabard worn over the person’s outside clothing the letter “N”, not less than 15 centimetres high in red on a white ground, in clearly visible vertical positions to the front and rear of the person’s torso, or
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(b) in the case of a mechanically propelled vehicle other than a motorcycle, there are displayed on the vehicle rectangular plates or signs bearing the letter “N”, not less than 15 centimetres high in red on a white ground, in clearly visible vertical positions to the front and rear of the vehicle.
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