What does the broken yellow line road marking mean?

Parking prohibited at all times.
The edge of the carriageway or hard shoulder.
Slow lane for heavy vehicles only.
No stopping for any reason except in an emergency.

Explantion: A single broken yellow line along the side of the road marks the edge of the carriageway/hard shoulder. This is normally for the use of pedestrians and cyclists. As a driver, however, you may use it briefly to allow faster traffic to overtake, but only where it is safe to do so.

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What does the broken yellow line road marking mean?

Legal Matters/Rules of the Road