Question Topic: Road and traffic signs
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Explanation: A continuous white line is used on many roads to indicate the edge of the carriageway. This can be useful when visibility is restricted. The line is discontinued at junctions, lay-bys, and entrances to or exits from private drives.
Category: Road and traffic signs
References: The Official DVSA Guide to Driving: Section 6, Highway Code: Page 114, Know Your Traffic Signs: Page 65