Lane marking lines — Oklahoma Permit Test

White dashes mean traffic moves in the same direction on each side of the line, and passing is permitted when it's safe.

White lines separate lanes going your way, so the danger in changing lanes comes from beside and behind you, not head-on.

White Dashes—Traffic moves in the same direction on each side of the white dashes. Passing is permitted when it’s safe.

A solid yellow line on your left tells you that you are on the proper side of the road, and that crossing it brings danger from approaching vehicles or obstacles in the median.

The line on your left is a quick check that you are not drifting into the side oncoming cars use.

(1) if a solid yellow line is on the left, you are on the proper side of the road and (2) if you cross that line, there’s a danger from approaching vehicles or from obstacles in the median.

A solid white line means traffic moves in the same direction on each side, but passing is hazardous, as when you are approaching an intersection or merge area.

Near intersections and merges cars are changing lanes and stopping, so a lane change there is where side-swipes happen.

Solid White Line—Traffic moves in the same direction on each side of the line, but passing is hazardous, as when you’re approaching an intersection or merge area.

What do white dashed lines between two lanes tell you?

Traffic runs in the same direction; you may pass when safe. White lines separate lanes going your way, so the danger in changing lanes comes from beside and behind you, not head-on. Oklahoma Driver Manual, p.32: “White Dashes—Traffic moves in the same direction on each side of the white dashes. Passing is permitted when it’s safe.”