which of the following is not an advantage of enhanced mirror settings?

The option that is not an advantage of enhanced mirror settings is: “Head checks are no longer needed.” Enhanced mirror settings greatly reduce blind spots and cut down how far you need to turn your head, but they never replace the need for a quick over-the-shoulder head check. You still must look to the side before changing lanes or merging; relying only on mirrors is unsafe. If your question came from a multiple-choice list, the incorrect “advantage” you should pick is the one that claims head checks (or shoulder checks) are no longer necessary.