Mirror checks should be done: Do you currently have car insurance? Insurance is mandatory to drive in Ohio Yes I have insurance. But please show me your best quotes. No, please help me find the best insurance. Question Mirror checks should be done: Answers Frequently as a part of your normal searching routine. Only when turning. Only when changing lanes. Explanation Frequent mirror checks should be part of your normal searching routine. Additionally, make a special point of using your mirrors before changing lanes, when stopping at an intersection, and before slowing down.