White lane lines — District of Columbia Permit Test

White lane lines on the District of Columbia permit test — 3 rules, each with the reason behind it and a question on it while it is fresh.

The rules

Broken white lines separate lanes of traffic going in the same direction; you may change lanes with caution.

A broken white line lets you move over, but the lane beside you is full of cars going your way at speed.

Broken white lines separate lanes of traffic going in the same direction. You may change lanes with caution.

DC Driver Manual, p.112

Solid white lines show turn lanes and discourage lane changes near intersections, ramps and other places where lane changes might be dangerous; they also mark the right edge of the pavement.

Changing lanes near a corner or ramp is when drivers are turning and merging, and the solid line warns you off.

Solid white lines show turn lanes and discourage lane changes near intersections, interchange/on- and off-ramps, and at other locations where lane changes might be dangerous.

DC Driver Manual, p.113

Double solid white lines separate same-direction lanes, often a special use lane such as an HOV lane; you may not cross them, and may enter the special lane only where signs and markings allow.

Cars in a special lane may move much faster than yours, and crossing in at a random spot cuts right in front of them.

Double solid white lines separate lanes of traffic going in the same direction.

DC Driver Manual, p.113

On the test

What do broken white lines mean?

Same-direction lanes; change with care. A broken white line lets you move over, but the lane beside you is full of cars going your way at speed. DC Driver Manual, p.112: “Broken white lines separate lanes of traffic going in the same direction. You may change lanes with caution.”

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 DC Driver Manual, published by the District of Columbia Department of Motor Vehicles, and against the state code itself. Last checked 2026-10-05.