Lane Markings Explained — Lines, Colors and Meanings
Road markings communicate rules that every driver must follow. Understanding the difference between white and yellow lines, solid and dashed lines, and double lines is essential for your DMV test and for driving safely every day.
Key Facts to Remember
- Yellow lines divide traffic going in opposite directions
- White lines divide traffic going in the same direction
- Dashed lines = lane changes or passing allowed when safe
- Solid lines = stay in your lane
- Double solid yellow = no passing from either direction
- Center turn lanes are for turning left only — not passing
Yellow Lines — Divide Opposite Traffic
Yellow lines separate traffic flowing in opposite directions. A solid yellow line on your side of the road means you may not cross it to pass. A broken yellow line means passing is allowed when safe. Double solid yellow lines mean no passing from either direction — these appear on roads where passing is dangerous due to curves, hills, or limited visibility.
White Lines — Same Direction Traffic
White lines separate traffic moving in the same direction. Dashed white lines between lanes mean you may change lanes when safe to do so. Solid white lines indicate you should stay in your lane — they appear at intersections, on exit ramps, and near bike lanes. A solid white line at an intersection marks the stop line where you must stop.
Double Yellow Lines
Double solid yellow lines are painted on roads where passing is prohibited in both directions. You may not cross double yellow lines to pass another vehicle. However, you may cross double yellow lines to make a left turn into a driveway or side street, as long as it is safe to do so.
Center Turn Lanes
A center turn lane is marked with yellow lines and left-turn arrows pointing in both directions. Drivers from either direction may use it only for turning left. You must not use the center turn lane for passing or as a travel lane. Enter the center turn lane only when you are ready to turn.
Edge Lines and Special Markings
White edge lines mark the right side of the road. Yellow edge lines appear on the left side of divided highways. Raised pavement markers (reflectors) echo the color system: white between same-direction lanes, yellow on divided highways, and red on the wrong side of divided roads to warn you if you're going the wrong way.
Example DMV Test Questions
1. A solid yellow line on your side of the road means:
- A. You may pass if the road ahead is clear
- B. Passing is not allowed from your side
- C. Slow down — school zone ahead
- D. One-way traffic only
Explanation: A solid yellow line on your side means you may not cross it to pass. Only a broken yellow line permits passing when safe.
2. White dashed lines between lanes of traffic mean:
- A. Do not change lanes
- B. You may change lanes when safe
- C. Bike lane ahead
- D. Construction zone
Explanation: Dashed white lines separate same-direction lanes and indicate that lane changes are permitted when it is safe to do so.
3. You may cross double solid yellow lines to:
- A. Pass a slow vehicle
- B. Make a left turn into a driveway
- C. Drive in the center turn lane
- D. Never — it is always illegal
Explanation: You may cross double solid yellow lines only to turn left into a driveway or side street when it is safe. Passing is never allowed across double solid yellow lines.
Ready to Practice More?
Take a full DMV practice test with real exam-style questions.
Start Practice Test