White lane lines — Massachusetts Permit Test

White lane lines separate lanes of traffic moving in the same direction.

White always means same direction and yellow always means opposite. Getting that pair straight decodes every marking on the road.

White lane lines separate lanes of traffic moving in the same direction.

Once you have signaled and it is safe, you may cross a broken white line when changing lanes.

Broken means crossing is allowed. The signal and the check still come first.

Broken white lines separate lanes of traffic traveling in the same direction. Once you have signaled, and it is safe to do so, you may cross this line

A solid white line marks the right edge of the roadway or separates lanes going the same way, and you should not cross it unless you need to avoid danger.

It is a line you are allowed to be on both sides of and told not to cross. Bicycle lanes are marked with one.

You can go in the same direction on both sides of this line (except the shoulder), but you should not cross it unless you need to avoid danger.

Crossing a double solid white line is not allowed.

Two solid white lines is the strongest same-direction marking there is. It exists where a lane change would be dangerous.

A double solid white line separates two lanes of traffic going in the same direction. Crossing a double solid white line is not allowed.

A solid white or solid yellow line that turns into a dotted line is a continuation of the line through an intersection or highway interchange.

The dots are the same line carrying on where a car might legitimately cross it. They are not an invitation to change lanes.

A solid white or solid yellow line that turns into a dotted line (short dashes) is a continuation of the line through an intersection or highway interchange.

Unless you are turning, exiting a highway, or changing lanes, always stay between the lane lines.

Drifting across a line is how a sideswipe starts. The lines only work if everybody stays inside them by default.

Unless you're turning, exiting a highway, or changing lanes, always stay between lane lines.

What do white lane lines separate?

Lanes of traffic moving in the same direction. White always means same direction and yellow always means opposite. Getting that pair straight decodes every marking on the road. Massachusetts Driver's Manual, p.89: “White lane lines separate lanes of traffic moving in the same direction.”