A registered vehicle should have: Question A registered vehicle should have: Answers A mirror on the left side only. Mirrors on both the left and right sides. A mirror on the right side only. Only a rearview mirror. Explanation For safe driving, it is important to be aware of what is happening on all sides of your vehicle. A vehicle should have mirrors on both sides, which should be checked regularly. This questions appears in the following tests: District Of Columbia Class A Knowledge Test District Of Columbia Class A Knowledge Test District Of Columbia Class B Knowledge Test Minnesota HazMat New Jersey Tank Tennessee Class A Knowledge Test