What does the solid yellow line indicate?

• Passing or changing lanes is permitted.
• Passing or changing lanes is not permitted.
  Explanation:

  "A solid yellow line indicates that passing or changing lanes is not permitted. Drivers must stay in their lane for safety and avoid overtaking in areas marked with this line."
• Passing or changing lanes is only permitted for vehicles on the right side of the road.
• Passing or changing lanes is only permitted for vehicles on the left side of the road.