Final answer:
You are allowed to drive on the left half of a two-way highway when safely passing another vehicle, to avoid an obstruction, when making a left turn, or if directed by traffic signs, signals, or law enforcement.
Step-by-step explanation:
On a two-way highway, you are allowed to drive on the left half of the roadway under certain conditions:
- When overtaking and passing another vehicle going in the same direction, provided it is done safely and without interfering with the safe operation of any vehicle approaching from the opposite direction.
- If there is an obstruction necessitating a move to the left to avoid it and it's safe to do so, given that you must yield to any traffic using the left lane for passing.
- When a specific lane is designated to make a left turn.
- When it is part of the flow directed by traffic signs or signals, or by law enforcement.
It is important to always follow traffic laws and road signs, and to never drive on the left half of the roadway when it is not permitted, as this can lead to dangerous situations or legal consequences.