What's the minimum distance from which an approved driving instructor (ADI) must be able to read a number plate that has letters and figures 79 mm high and 50 mm wide? What's the minimum distance from which an approved driving instructor (ADI) must be able to read a number plate that has letters and figures 79 mm high and 50 mm wide?

• Possible answers:

   
• A. 22.7 metres (75 feet)
• B. 26.5 metres (87 feet)
• C. 30.5 metres (100 feet)
• D. 46.0 metres (150 feet)