Question The use of a hand-held mobile device while driving is: Answers Encouraged. Acceptable if weather conditions are clear. Permitted if checking a work-related email. Prohibited. Explanation While operating a CMV, you may not make voice calls if you need to hold your phone or press more than one button to do so. Additionally, you may not send or read text messages while driving. Take a FREE Practice Test Now This questions appears in the following tests: North Carolina Knowledge Test Class A ,