When is it illegal to overtake another vehicle?

Answer: A — When there's a solid line or at intersections without a clear view

Overtaking another vehicle is illegal when there's a solid line marking on the road or at intersections where visibility is limited. A solid line indicates that overtaking is prohibited in that area to ensure safety, as it often signifies that visibility is insufficient to assess whether the maneuver can be completed without risk of collision. Additionally, intersections often have complex traffic patterns and other vehicles maneuvering, making it particularly dangerous to attempt an overtake. In contrast, the other scenarios do not inherently relate to legal constraints on overtaking; for instance, overtaking when a vehicle is moving slowly doesn't consider road markings or safety conditions, driving on city streets may permit overtaking provided it's done safely, and the presence of another vehicle approaching from behind does not automatically make overtaking illegal unless specific road markings indicate otherwise.