Changing lanes — California Permit Test

Changing lanes on the California permit test — 6 rules, each with the reason behind it and a question on it while it is fresh.

The rules

Before you change lanes, signal, check your mirrors, and check the traffic behind and beside you.

Mirrors show most of the road behind, and the order of the checks is what keeps the gap real.

Before you change lanes: • Signal. • Check your mirrors. • Check traffic behind and beside you.

California Driver’s Handbook, p.15

Look over your shoulder in the direction you plan to move, to make sure the lane is clear.

The mirror leaves a patch of road beside you empty-looking when there is a car in it.

Look over your shoulder in the direction you plan to move to make sure the lane is clear.

California Driver’s Handbook, p.15

Check your blind spots for other vehicles, motorcyclists and bicyclists, and do not let your vehicle drift into another lane.

A motorcycle fills a small part of the mirror and disappears from it completely at the wrong moment.

Check your blind spots for other vehicles, motorcyclists, and bicyclists.

California Driver’s Handbook, p.15

Be sure there is enough space for your vehicle in the next lane; it is not necessary to slow down before a lane change.

Braking first only closes the gap you were aiming at and surprises the driver behind you.

Be sure there is enough space for your vehicle in the next lane. It is not necessary to slow down before a lane change.

California Driver’s Handbook, p.15

Stay in one lane as much as possible and do not weave in and out of traffic.

Weaving gains a car length and costs every driver around you the chance to guess what you will do.

Stay in one lane as much as possible. Do not weave in and out of traffic.

California Driver’s Handbook, p.15

Once you start moving through an intersection, keep going, and if you miss a turn keep driving until you can safely and legally turn around.

Stopping halfway through or swerving late is how a missed turn becomes a collision.

Once you start moving through an intersection, keep going. If you start to make a turn, follow through.

California Driver’s Handbook, p.15

On the test

What comes first when you change lanes?

Signal, then check mirrors and traffic. Mirrors show most of the road behind, and the order of the checks is what keeps the gap real. California Driver’s Handbook, p.15: “Before you change lanes: • Signal. • Check your mirrors. • Check traffic behind and beside you.”

How this works

Most practice tests hand you a bank of questions and leave the manual somewhere else. This one puts them together.

You read one law and the reason behind it, then answer a question on that law while it is still fresh. Get it right and you move on; get it wrong and you have found the gap while it is cheap to fix, not on the morning of the exam.

Learning one rule at a time, and proving it immediately, is what turns a manual you skimmed into something you actually know — and it makes studying feel like getting somewhere rather than like waiting to find out.

What it costs

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  • Paying opens the rest of the cards, unlimited full-length practice tests, and retests built from exactly the questions you got wrong.
  • Every level up to Prepared — 3 tests passed in a row.
  • Do the work, fail the real exam, and we refund you.

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Where these come from

Every rule here is checked against California Driver’s Handbook, published by the California Department of Motor Vehicles, and against the state code itself. Last checked 2026-09-21.