You may pass another vehicle:

You may not pass another vehicle on a hill or in a curve because you cannot see oncoming traffic and may cause a collision. Never pass another vehicle by driving onto the shoulder of a highway. Passing another vehicle by driving over a solid yellow line is prohibited.

• In a curve or on a hill because the chance is small that another vehicle is coming.
• By using the shoulder of the highway.
• If your lane is next to a solid yellow line and the passing lane is clear ahead.
• None of the above.