When can a driver legally pass another vehicle?

The situation described in the correct answer highlights that a driver can legally pass another vehicle when the lane line is broken and it is safe to do so. This means that as long as the line dividing the lanes allows for passing, and there are no other safety concerns such as oncoming traffic, it is permissible for a driver to change lanes and pass another vehicle. The emphasis on safety ensures that the maneuver is conducted without endangering the driver, the vehicle being passed, or other road users.

In contrast, the other choices suggest limitations or restrictions that do not align with traffic laws. Stipulations like passing only on highways would be inaccurate, as passing can also be legal on certain roads outside of highways, as long as the conditions allow it. A solid line indicates that passing is prohibited, reinforcing the importance of understanding the meaning of road markings. Lastly, the notion that passing is never legal is incorrect, as passing is a common and often necessary action when driving safely and legally.