Final answer:
To check your "Blind Spot," you must look over your shoulder. This is crucial for safe driving as mirrors do not cover all angles around a vehicle, and checking blind spots is essential before changing lanes or merging.
Step-by-step explanation:
This is because the mirrors on your vehicle do not cover every angle, leaving certain areas around your vehicle that you cannot see by using the mirrors alone. These areas are commonly referred to as 'blind spots.' To safely determine if another vehicle or an obstacle is present in your blind spot before changing lanes or making certain maneuvers, you should physically turn your head to look over your shoulder to directly check these areas. In contrast, looking under the hood or in the trunk would not assist in checking for blind spots. These actions are unrelated to the driving task of lane changes or merging. Being aware of your blind spots and knowing how to check them is an essential part of safe driving practices.