When should you turn on the headlights?

• When you are driving at night or at any time when you cannot see clearly 150 meters away.
  Explanation:

  "You must turn your headlights on when you are driving at night or at any time when you cannot see clearly 150 meters (500 feet) away in front of you."
• When you are driving at night or at any time when you cannot see clearly 50 meters away.
• When you are driving at night or at any time when you cannot see clearly 10 meters away.
• Only at night