Before you change lanes, what does the manual say to do in addition to checking your mirrors?
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A.
Look over your left and right shoulders to check your blind spots. Correct
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B.
Wait until the vehicle directly behind you has fully passed.
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C.
Rely on your side mirrors and blind-spot sensors alone.
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D.
Tap your brakes two times to warn any driver following you.
The answer is "Look over your left and right shoulders to check your blind spots."
Mirrors alone leave blind spots, so the manual tells you to look over both shoulders before changing lanes. Drivers who trust a newer factory blind-spot monitor, or who assume the side mirrors cover everything, are the ones who pick C; the manual specifically says do not depend on mirrors or sensors alone.
The traps in the wrong answers
B. Wait until the vehicle directly behind you has fully passed.
The manual does not require the adjacent lane to be empty first; it requires only that no one is going to pass you and that your blind spots are clear. This answer overstates the check-behind step into a rule requiring the lane behind to clear entirely before any lane change.
C. Rely on your side mirrors and blind-spot sensors alone.
The manual expressly says do not depend on mirrors or sensors alone; a shoulder check is still required. This answer trusts a newer factory blind-spot monitor as a full substitute for the physical head check the manual still requires.
D. Tap your brakes two times to warn any driver following you.
Brake-tapping is not part of the lane-change procedure; the manual mentions gentle brake tapping only as a way to discourage a tailgater. This answer borrows the folk habit of tapping brakes to alert following drivers and extends it into a lane-change signal.
This question tests your knowledge of Lane Changes & Merging in Pennsylvania. Source: Pennsylvania Driver Manual, "LOOKING BEHIND," p.38..
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