When checking your mirrors: Question When checking your mirrors: Answers Do not use the passenger side mirror. Do not use the driver's side mirror. Both mirrors should be used. Look in each mirror for long stretches of time. Explanation To travel safely, it is essential that you know what is happening on all sides of your vehicle at all times. Check all mirrors frequently while driving. This questions appears in the following tests: District Of Columbia Tank Indiana Double New Jersey Class A Knowledge Test North Dakota Class A Knowledge Test North Dakota Double