Question Before changing lanes to the left: Answers Check your left mirror, then look to the left. Check your right mirror, then your left mirror. Check your left mirror, then your right mirror. Use your horn, then speed up. Explanation Always check your mirror on the appropriate side before changing lanes. You should also turn your head and glance over your shoulder to check your blind spot in the direction of your move. Take a FREE Practice Test Now This questions appears in the following tests: Pennsylvania Practice Test