A single solid white line means you may only cross the line in order to avoid a hazard. Thus, the correct option is B.
What is a single solid white line?
A single solid white line may be defined as a lane of traffic going in the same direction that protects the safety of pedestrian people or people with small vehicles like bicycles.
A single solid white line at the side of the roadway indicates that the drivers are not allowed to pass or cross that line to go around someone turning left from the highway or roadway.
This line overall implicated in the roads to maintains the mishappening or unwanted road accidents that threaten the life of common people.
Therefore, a single solid white line means you may only cross the line in order to avoid a hazard. Thus, the correct option is B.
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