Before changing lanes or attempting to pass another vehicle, you should:
- Check your blind spots and mirrors.
- Signal your intention before changing lanes.
- All of the above. ✓
Answer: C. All of the above.
You should do all of these: check your blind spots and mirrors, and signal your intention before changing lanes.
Why this is the answer
The handbook says that when conditions are right to pass, you check your mirrors and signal your lane change. Before entering the left lane, you also look quickly over your left shoulder through the back side window, because mirrors can leave blind spots. It warns not to depend on mirrors alone and says to look over your shoulder before changing lanes or passing. Since both signaling and checking mirrors and blind spots are required, the combined choice fits the handbook.
Why the other answers are wrong
- A. Check your blind spots and mirrors. — Checking blind spots and mirrors is necessary, but by itself it leaves out the handbook's instruction to signal your lane change before you move.
- B. Signal your intention before changing lanes. — Signaling is necessary, but by itself it leaves out the handbook's instruction to check your mirrors and look over your shoulder for blind spots before changing lanes or passing.
Remember it
Look, signal, then move: mirrors and a shoulder check come before the lane change.