Before turning left, it is important to:
- Sound your horn.
- Yield to oncoming vehicles. ✓
- Swing to the right side of your lane.
- Wait until oncoming traffic has a red light.
Answer: B. Yield to oncoming vehicles.
Before turning left, yield to oncoming vehicles.
Why this is the answer
The handbook's right-of-way chapter handles left turns directly: when you turn left, you give the right-of-way to any vehicle coming straight toward you from the opposite direction. A flashing yellow left-turn arrow is described the same way — you may turn, but you must yield to oncoming traffic. So the thing to do before and during the turn is let the traffic coming at you go first and turn only when it is clear.
Why the other answers are wrong
- A. Sound your horn. — Nothing in the handbook tells you to sound the horn before a left turn; the horn is not what settles who goes first.
- C. Swing to the right side of your lane. — The passages say nothing about swinging to the right side of your lane, and that move is not what gives way to oncoming traffic.
- D. Wait until oncoming traffic has a red light. — You are not required to sit and wait for oncoming traffic to get a red light; the rule is to yield to that traffic, and a flashing yellow arrow lets you turn when it is clear.
Remember it
On a left turn, the car coming at you goes first — you turn only after it has passed or is far enough back.
Official handbook: Texas Driver Handbook (DL-7), Chapter 3: Safety Responsibility , p. 20