What does the single yellow line along the side of the road mean?

Explanation: Yellow lines along the side of the road tell you that waiting restrictions apply here.
If there's just one line, it means that the waiting restrictions are at certain times. There may be a yellow plate on a wall or lamppost nearby telling you what these times are.
If the yellow lines are double, it means that you cannot wait there at any time.

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References: The Official DVSA Guide to Driving: Section 6, Know Your Traffic Signs: Page 39