Question When driving, you may: Answers Operate a cell phone, if it does not affect your driving. Operate a cell phone, if the call is less than three minutes in length. Operate a cell phone, if no one else is in riding the cab. Not operate a cell phone. Explanation While driving a CMV, using a hand-held cell phone to make a call, or pressing more than one button when dialing, is prohibited. Take a FREE Practice Test Now This questions appears in the following tests: Pennsylvania Knowledge Test Class A ,