When driving alongside a double longitudinal center line where the line on your side is broken and the line on the opposite side is continuous, what are you permitted to do?

1. You must obey the continuous line and never cross under any circumstance
2. You may only cross if authorized by a portable construction flag
3. Both lanes must immediately slow down and prepare to merge into a single lane
4. You may cross the line to overtake or turn, provided the maneuver is executed safely