The Turning, Merging, and Passing Questions You're Most Likely to Miss
Why Turns, Merging, and Passing Trip People Up
The California DMV written test isn't trying to trick you. Every question comes straight from the handbook. But turns, merging, and passing are the areas where small details matter—and where a lot of first-time test-takers and renewal applicants lose points. Let's walk through the rules, see how the test phrases them, and work through a real-world scenario for each.
Turning Positions: Get in the Right Lane First
The core rule is simple: signal 100 feet before you turn, and turn from the lane closest to your direction of travel. That means:
- Right turn: start from the lane closest to the right edge. Don't swing wide into another lane.
- Left turn from a two-way street onto a two-way street: start from the lane closest to the center line.
- Left turn from a two-way street onto a one-way street: start from the far-left lane. If there are three or more lanes going your way, you can finish in any open lane.
The test often asks: "You are turning left from a two-way street onto a one-way street with three lanes. Which lane must you end in?" The answer is any open lane—but you must start from the far-left lane.
Worked scenario: You're on a two-way street with two lanes in your direction, turning left onto a one-way street with three lanes. You start in the left lane, signal 100 feet early, and finish in the rightmost open lane. That's legal. If you had started in the right lane, you'd be wrong.
Turns on Red: Yes, Sometimes
A right turn on red is allowed after a full stop—unless a sign says otherwise. You must yield to pedestrians and traffic with a green light.
A left turn on red is allowed only when you're turning from a one-way street onto another one-way street. No sign can prohibit it (though some do), and you still must yield.
The test loves this one: "You may turn left against a red light when..." The correct answer is when turning from a one-way street onto a one-way street.
Worked scenario: You're on a one-way street and want to turn left onto another one-way street. The light is red. After stopping and checking for a sign, you may turn left when it's safe. If either street were two-way, that turn would be illegal.
U-Turns: Where You Can and Can't
U-turns are legal in California unless a sign prohibits them or you're in a specific no-U-turn zone. You must signal and use the left turn lane or far-left lane. Never make a U-turn in heavy traffic or where you can't see clearly.
The test may ask: "When can you make a U-turn?" The safe answer: when you can see in all directions and it's not prohibited.
Worked scenario: You're on a wide residential street with no traffic and no signs. You signal, check for oncoming cars, and turn when safe. On a busy boulevard with a sign saying "No U-Turn," you don't.
Freeway Entry and Exit: Merge Smoothly
When entering a freeway, be in the proper lane on the on-ramp, match the speed of traffic, and merge when safe. Don't stop unless absolutely necessary. Use your mirrors, turn signals, and a quick head check over your shoulder.
When exiting, signal early, move into the exit lane, and adjust your speed for the off-ramp.
The test often asks: "What should you do when entering a freeway?" The answer: be at or near the speed of traffic and merge when safe.
Worked scenario: You're on an on-ramp with a short merge lane. You accelerate to match highway speed, check your mirrors and blind spot, signal, and merge into a gap. If you stop at the end of the ramp, you're likely to cause a collision.
Passing Restrictions: When Not to Pass
Never pass on the left if the driver ahead is signaling a left turn. Never drive off the paved or main-traveled part of the road to pass. And never pass on a curve or hill where you can't see oncoming traffic.
Also, if someone is passing you, maintain your lane and speed—don't speed up.
The test asks: "You are driving on a two-lane road and the car ahead is signaling a left turn. What should you do?" The answer: don't pass on the left; wait until it's safe.
Worked scenario: You're behind a car on a two-lane road. It signals left. You must not pass on the left—even if you have room—because the driver may turn into your path. Wait, then proceed when clear.
Quick Self-Check
1. You want to turn left from a one-way street onto a two-way street. The light is red. Can you turn? A) Yes, after stopping. B) No, left on red is only from one-way to one-way. C) Only if a sign says so.
2. You're entering a freeway. What's the safest approach? A) Stop at the end of the ramp and wait for a gap. B) Drive slowly and merge when you feel ready. C) Match traffic speed and merge when safe.
3. You're on a two-lane road and the car ahead signals a left turn. You should: A) Pass on the left. B) Pass on the right if there's a shoulder. C) Wait until it's safe to pass.
Answers: 1-B, 2-C, 3-C.
Key Takeaways
- Signal 100 feet before turning and turn from the lane closest to your direction of travel.
- Left on red only from one-way to one-way; right on red after a full stop unless prohibited.
- Match traffic speed when merging onto a freeway—don't stop unless necessary.
- Never pass on the left if the car ahead is turning left, and never pass on a curve or hill.
- If you're being passed, hold your lane and speed.
Ready to practice more? Try Mia at lastdmv.com for a quick, friendly way to test your knowledge.
Frequently asked questions
Can I turn left on a red light in California?
Only when turning from a one-way street onto another one-way street, and only if no sign prohibits it. You must yield to pedestrians and traffic with a green light.
When am I allowed to make a U-turn?
You may make a U-turn when it's safe, you can see in all directions, and no sign prohibits it. Never make a U-turn in heavy traffic or where you can't see clearly.
How fast should I be going when merging onto the freeway?
You should be at or near the speed of traffic on the freeway. Use the on-ramp to accelerate, then merge when safe. Don't stop unless absolutely necessary.