Pennsylvania CDL Practice Exam

Before making a lane change, it's essential to ensure that the lane is clear of vehicles or obstacles. The correct approach involves using both side mirrors and checking blind spots. Side mirrors provide a view of the area next to and behind your vehicle, allowing you to spot vehicles that may be in your path. However, relying solely on mirrors can be insufficient, as some vehicles might not be visible due to blind spots. Checking blind spots entails physically turning your head to look over your shoulder. This action helps identify any vehicles that may be in your blind spots—areas that mirrors may not cover adequately. By integrating both the use of side mirrors and a shoulder check, you significantly increase your awareness of your surroundings and reduce the risk of an accident during a lane change. This comprehensive method ensures that you are fully aware of any potential hazards before merging into another lane, making it the safest and most responsible choice.