What is the purpose of the solid white line between two roads?

• It indicates a lane that can be crossed when turning.
• It marks the boundary between different traffic lanes, and crossing is not allowed.
  Explanation:

  "A solid white line separates lanes of traffic going in the same direction. Crossing this line is generally not allowed unless it's necessary for turning or exiting."
• It shows where to stop for a red light.
• It marks the beginning of a pedestrian crossing.