When driving on a multi-lane roadway you should check for blind spots behind you by?

When driving on a multi-lane roadway, you should check for blind spots behind you by turning your head to look over your shoulder before changing lanes. Additionally, it's important to use your mirrors to monitor surrounding traffic, but remember that mirrors don’t cover all blind spots. Always signal your intentions clearly to alert other drivers. This practice helps ensure that it is safe to change lanes or merge.