Final answer:
On a two-lane highway, driving on the left half of the roadway is permitted when overtaking another vehicle, when the right half is obstructed, or when making a left turn, as long as it is done safely and in accordance with traffic laws.
Step-by-step explanation:
On a two-lane highway, you are allowed to drive on the left half of the roadway under certain conditions such as when overtaking and passing another vehicle proceeding in the same direction, when the right half is closed or obstructed, or when making a left turn. However, driving on the left should only be done when it is safe to do so and in compliance with the traffic laws that apply to that roadway. It is important to always ensure that the maneuver does not interfere with the safe operation of oncoming traffic in the opposite lane. While specific regulations can vary by location, these general guidelines apply.
Overtaking another vehicle requires that you first ensure the left lane is visibly clear of oncoming traffic, and then you must return to the right side of the road as soon as you have safely passed the other vehicle. When a road is obstructed or closed, you're also permitted to use the left half temporarily but must yield to oncoming traffic as soon as it becomes necessary. For example, if there is a roadway construction, you might have to navigate on the left side, but with great caution. Lastly, making a left turn at an intersection, into a private road, or a driveway from a two-lane highway typically necessitates moving to the left half of the roadway in preparation to turn.