You are driving in the left lane and want to move into the right lane. You should:

Check your mirrors, signal, and look over your left shoulder for other vehicles before changing lanes.
Check your mirrors, signal, and look over your right shoulder for other vehicles before changing lanes. ✓
Check your mirrors, signal, and look over both shoulders for other vehicles before changing lanes.
Check your mirrors, signal, and change lanes.

Answer: B. Check your mirrors, signal, and look over your right shoulder for other vehicles before changing lanes.

Before moving from the left lane into the right lane, check your mirrors, signal, and look over your right shoulder to make sure that lane is clear.

Why this is the answer

The handbook's turning steps say to look behind and to both sides to see where other vehicles are before you change lanes, and the passing steps say to check the rearview mirror, the side mirrors, and look over your shoulder into the blind spot. When you are moving to the right, the blind spot you must clear is the one over your right shoulder, so you aim your shoulder check in the direction the car is going. Signaling first tells drivers around you what you plan to do.

Why the other answers are wrong

A. Check your mirrors, signal, and look over your left shoulder for other vehicles before changing lanes. — Looking over your left shoulder checks the lane you are leaving, not the right lane you are moving into, so it misses the blind spot that matters here.
C. Check your mirrors, signal, and look over both shoulders for other vehicles before changing lanes. — The handbook calls for a shoulder check into the blind spot on the side you are moving toward, and checking both shoulders adds a look away from the lane you are entering rather than covering it.
D. Check your mirrors, signal, and change lanes. — Mirrors alone leave a blind spot uncovered, so changing lanes without a shoulder check skips the step the handbook describes.

Remember it

Your shoulder check follows your car: moving right means looking over your right shoulder.

Official handbook: Texas Driver Handbook (DL-7), Chapter 6: Signaling, Passing, and Turning , p. 39

Explanation drafted with AI (deepseek-flash) from the official handbook passage cited above, then checked automatically and by a second model on 2026-10-23. Always confirm with the official handbook.

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