When is it illegal to cross an intersection?

Answer: B — When you can’t get all the way across when the light turns red

It is illegal to cross an intersection when you can't get all the way across when the light turns red because this situation creates a potential hazard for other drivers and pedestrians. When the traffic signal changes to red, vehicles need to stop behind the stop line, and if a vehicle is already in the intersection, it obstructs cross traffic and can lead to collisions. The law requires that drivers ensure they have a clear path before entering the intersection, particularly when the light is green, to avoid blocking traffic if the light changes. This promotes safer driving practices and ensures smoother traffic flow. Other scenarios may have specific rules associated with them, but when it comes to safely navigating intersections, ensuring you can completely cross before the light changes is crucial in maintaining traffic safety.