Changing lanes — Colorado Permit Test

Changing lanes on the Colorado permit test — 4 rules, each with the reason behind it and a question on it while it is fresh.

The rules

Changing lanes includes changing from one lane to another, passing another vehicle, merging onto a roadway from an entrance ramp, and entering the roadway from the curb or shoulder.

All four are the same maneuver wearing different names, and all four need the same checks. Pulling out from the curb is the one people forget.

Changing lanes includes: changing from one lane to another

Colorado Driver Handbook, p.15

A blind spot is the area slightly to the rear and side of your vehicle that you cannot see in your mirrors, so you must look over your shoulder before moving into a lane.

A whole car fits into that space and the mirrors show none of it. Turning your head is the only check that finds it.

Look over your shoulder to check your blind spot, which is the area slightly to the rear and side of your vehicle that you cannot see in your mirrors

Colorado Driver Handbook, p.15

When changing lanes, activate your turn signal and leave it active for a minimum of 3 seconds or 200 feet before leaving your lane.

Three seconds is long enough for the driver beside you to notice and decide. Signaling as you move gives them no say in it.

Leave it active for a minimum of 3 seconds or 200 feet before leaving your lane

Colorado Driver Handbook, p.15

After you are centered in the new lane, check the mirror for traffic behind you, and deactivate your turn signal within 3 seconds of completing the lane change.

The car that was two lanes over may now be right behind you. Canceling the signal stops anybody planning around a second move you are not making.

After you are centered in the new lane check the mirror for traffic behind you

Colorado Driver Handbook, p.15

On the test

Which of these counts as a lane change?

Pulling out from the curb into traffic. All four are the same maneuver wearing different names, and all four need the same checks. Pulling out from the curb is the one people forget. Colorado Driver Handbook, p.15: “Changing lanes includes: changing from one lane to another”

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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Where these come from

Every rule here is checked against Colorado Driver Handbook, published by the Colorado Division of Motor Vehicles, and against the state code itself. Last checked 2026-09-16.