Under what condition can you drive to the left of the center line on a two-lane road?

Driving to the left of the center line on a two-lane road is permissible primarily for the purpose of passing another vehicle. This action is part of ensuring safe and efficient use of the roadway as it allows for overtaking slower vehicles or those that are obstructed. When passing, it is essential to adhere to safe practices, such as ensuring that the roadway is clear and that it is safe to re-enter the right lane once the maneuver is complete.

In contrast, the other options do not provide valid reasons for crossing the center line. Driving left of the center line without a passing context, such as simply because there are no cars behind you, does not align with the rules of the road and could create hazards. Similarly, while making a left turn typically involves going left of the center line, it is done within a more confined scenario and does not apply to general travel along the roadway. The statement about only crossing the center line at intersections is also misleading, as this does not encompass the broader and necessary context of safely passing vehicles when conditions allow.