What does a double yellow line indicate?

A double yellow line indicates that stopping or parking is not allowed at any time along that stretch of road. This is particularly important for maintaining traffic flow and ensuring safety, as it prevents obstructions that could hinder visibility or create hazards for other drivers. The presence of a double yellow line signifies a strict regulation that drivers must adhere to for the wellbeing of all road users.

The other options suggest scenarios where parking may be allowed or regulated, which is not the case with a double yellow line—it specifically prohibits any form of parking or stopping.