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To warn you the speed limit has changed
To warn of hazards ahead
To warn you there's a speed camera ahead
To warn you not to change lanes
Explanation: White lines painted on the road give you information about where you may drive and when.
The broken white line marks the boundary between lanes on your side of the dual carriageway. But when the lines start to lengthen, with shorter gaps, this warns you of a hazard coming up - like a sharp bend.
Watch out for changes in the road markings so you can prepare for the hazard ahead.
Category: video clips
References: The Official DVSA Guide to Driving: Section 6, Highway Code: Rule 127, Know Your Traffic Signs: Page 62
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