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(in the US) They indicate a no passing zone. The white lines indicate multiple lanes of travel in the same direction, while the yellow lines indicate opposing lanes of travel.

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Q: Why there are markings of two parallel white lines and yellow lines on roads?
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Related questions

Can you park on a grass verge when the road has double yellow lines on it?

The yellow lines refer to parking controls on UK roads. When double yellow lines are in force, you can't. (note that double yellow lines are not always operational at all times. The restriction prevents parking on or adjacent to double yellow lines. There is no mention in the regulations about which side of the yellow lines and therefore they are effective for vehicles parked on pavements or verges. Look at the Highway code text next to the pictures of double yellow lines in the Road Markings section.


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Well, in the US, we do have roads with no center markings. You stay as far right as possible without sliding off the berm. In many rural areas with no center markings, vehicles slow and stop to let another driver pass on narrow roads or one lane bridges. But without solid or dash lines---as was the norm in many communities pre-1950s, drivers took their chances about when and where to pass. There were many head on collisions, many deaths. So the solid yellow, double solid yellow, and broken dash yellow were devised as common visual reminders of how drivers should behave in different situations.


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I can give you several sentences.The two roads run parallel to one another for several miles.The scientist traveled to a parallel dimension.Two parallel lines will never meet.


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Lane markings on roads are very important; they let the driver know the rules of the road. Solid centerlines usually yellow or white indicate the driver should not cross the line and stick to their side of the road to prevent accidents.


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