Before changing lanes on a multilane highway, you should:
- Sound your horn.
- Turn on your headlights.
- Reduce your speed.
- Check your mirrors and blind spots. ✓
Answer: D. Check your mirrors and blind spots.
Before changing lanes on a multilane highway, check your mirrors and blind spots.
Why this is the answer
The handbook describes blind spots as zones by the rear corners on each side that your mirrors and side vision do not show. Before moving to change lanes on a highway, it says to turn your head and confirm those zones are clear. Mirrors help, but the handbook's point is that they leave those rear-corner areas hidden, so you must check them too before moving over.
Why the other answers are wrong
- A. Sound your horn. — Sounding your horn is not a lane-change check, and the handbook does not tell you to do it before moving over.
- B. Turn on your headlights. — Turning on your headlights does not help you clear the blind spots before a lane change, and the handbook does not give that instruction here.
- C. Reduce your speed. — Reducing speed is not the step the handbook gives for preparing to change lanes; it tells you to check the blind areas first.
Remember it
Mirrors show most of the picture; a head turn covers the corners.