🎓 Prepared by students from Boğaziçi University

What are White Lane Markings?

White lane markings are painted lines on the road that define lane boundaries and control traffic flow. White solid lines separate lanes permanently, while white dashed lines allow drivers to cross between lanes when safe.

Short answer

White lane markings define road lanes: solid white lines separate lanes (do not cross), dashed white lines allow lane changes when safe.

Solid vs Dashed Lane Markings
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x: Road Position · y: Crossing AllowedSolid Line (Do Not Cross)Dashed Line (Cross if Safe)
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Step-by-step worked examples

You are on a lane with a solid white line between you and the next lane. Can you change lanes?

Solid white line = permanent lane separation.
You cannot cross a solid white line.
You must stay in your current lane until the line changes or ends.

The line between your lane and the passing lane is a dashed white line. What does this mean?

Dashed white line = crossing allowed.
If it is safe and you signal, you can change lanes or pass.
Always check mirrors and ensure no traffic is coming.

You see a dashed white line on a busy road with many cars. Can you cross it?

Dashed line = crossing is permitted.
However, the road is busy with traffic.
Only cross if it is safe — check mirrors and ensure enough space before changing lanes.
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Flashcards

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Quick quiz

Q1.What does a solid white line mean?

Correct answer: B. Solid white lines are permanent lane separators — drivers must not cross them.

Q2.A dashed white line allows you to…

Correct answer: B. Dashed lines allow lane changes when safe and when signalling your intent.

Q3.Can you overtake across a solid white line on a highway?

Correct answer: B. Solid white lines are permanent separators — crossing them is forbidden.

Q4.What should you do before crossing a dashed white line?

Correct answer: B. Before crossing any line, signal your intent and check that it is safe.
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Common mistakes

Confusing solid and dashed white lines.Correct: Solid = do not cross; dashed = cross if safe.

Crossing a solid white line to overtake.Correct: Solid lines are permanent — you cannot cross them.

Not signalling before crossing a dashed line.Correct: Always signal your lane change, even on dashed lines.

Crossing a dashed line without checking mirrors.Correct: Check mirrors and blind spots before every lane change.

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FAQ

What are white lane markings?

White lane markings are painted lines that define lanes on the road. Solid lines prevent crossing; dashed lines allow safe crossing.

Can you cross a solid white line?

No — solid white lines are permanent lane separators. Crossing them is forbidden and dangerous.

When can you cross a dashed white line?

You can cross dashed white lines when it is safe, you have signalled, and there is no oncoming traffic.

What colour are Turkish lane markings?

White is the standard colour for lane markings. Yellow lines have different meanings (edge/edge of pavement).

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