You can always cross a single broken white or yellow line except

• A. When you are interfering with traffic by doing so
• B. When there is a pedestrian crossing
• C. When you are turning left
• D. When you are in heavy traffic

Answer: (A)

Crossing a single broken line is allowed when you can do it safely. The only time you should not cross is if doing so would interfere with other traffic. In practical terms, you shouldn’t move over the line to pass if it would cause another driver to slow suddenly, swerve, or adjust their speed awkwardly because of your maneuver. Pedestrians, turns, or heavy traffic aren’t automatic disqualifiers by themselves; the key is whether your crossing would disrupt or endanger other drivers. So the rule is: you can cross the broken line, except when it would interfere with traffic.