Where can road maintenance and construction vehicles be used or parked on the road?

• Only on the extreme left side of the road.
• Only on the extreme right side of the road.
• Only in the middle of the road.
• Anywhere on the road.
  Explanation:

  "Road maintenance and construction vehicles are permitted to be used or parked on any portion of the road as required for their work. Always exercise caution when driving near such vehicles."