When is passing a vehicle not permitted?

• Near a pedestrian crossover
• When approaching a crest or hill
• When there is not enough clear distance ahead to pass safely
• All of the above
  Explanation:

  "Passing within 30 meters of a pedestrian crossover is not permitted. Don't attempt to pass when approaching the crest of a hill or on a curve where your vision of oncoming traffic is obstructed and there is not enough clear distance ahead to pass in safety."