Question Mirrors should be: Answers Checked only when changing lanes. Checked frequently. Checked only if there is a reason to suspect a problem. Explanation When driving, you should regularly check your mirrors, both to be aware of traffic and to check for problems on your own vehicle. This questions appears in the following tests: Arizona Passenger Idaho Class B Knowledge Test Iowa Class A Knowledge Test Kentucky Passenger Louisiana Class A Knowledge Test Minnesota Class A Knowledge Test Minnesota Class B Knowledge Test Minnesota HazMat Minnesota Tank Mississippi Passenger Missouri Class A Knowledge Test Nevada Class A Knowledge Test North Carolina Class A Knowledge Test Ohio Tank Ohio Passenger South Dakota Passenger Virginia Class B Knowledge Test Washington Tank Wisconsin Passenger Wyoming Class A Knowledge Test Wyoming Class B Knowledge Test