What’s the purpose of a continuous white line along the side of the road?

Explanation: The edge of the carriageway is often marked with a continuous white line. This stops at junctions, lay-bys, and entrances and exits from private drives. In conditions of poor visibility, such as when it's foggy, this line can help you see the edge of the road.

Category: Band 2 traffic signs and signals

References: Highway Code: Page 114, Know Your Traffic Signs: Page 65