What does this sign indicate?

• Drivers are encouraged to pass other vehicles in the construction zone.
• There is a single lane for both directions, and passing is prohibited in the construction zone.
  Explanation:

  "This sign informs drivers that only one lane is available for both directions of traffic in the construction zone, and passing is strictly prohibited. Drivers should proceed with caution, follow traffic signals or flaggers, and wait their turn to pass safely through the single lane."
• The construction zone is only open to two-way traffic during specific hours.
• Vehicles must increase their speed to pass through the construction zone quickly.