When should mirror adjustments be made? Question When should mirror adjustments be made? Answers Before starting a trip While driving When a vehicle is stopped at a traffic signal Explanation Mirror adjustment should be checked prior to the start of each trip. Any attached trailer should be straight while mirrors are being adjusted. This questions appears in the following tests: Alaska Class B Knowledge Test Alaska Passenger Connecticut Double Iowa Class B Knowledge Test Maine Class A Knowledge Test Maine Class B Knowledge Test Michigan Class B Knowledge Test Nebraska Class A Knowledge Test Nevada Passenger North Carolina Tank Oklahoma Class B Knowledge Test Rhode Island Class A Knowledge Test South Dakota Class B Knowledge Test Tennessee Class B Knowledge Test Vermont Passenger Wyoming Class A Knowledge Test