Check Your Vehicle. Use the mirrors to keep an eye on your tires. It's one way to spot a tire fire. If you're carrying open cargo, you can use the mirrors to check it. Look for loose straps, ropes, or chains. Watch fora flapping or ballooning tarp. Special Situations. Special situations require more than regular mirror checks. These are lane changes, turns, merges, and tight maneuvers. Lane Changes. You need to check your mirrors to make sure no one is alongside you or about to pass you. Check your mirrors Before you change lanes to make sure there is enough room. After you have signaled, to check that no one has moved into your blind spot. Right after you start the lane change, to double- check that your path is clear. After you complete the lane change.