When are you not allowed to pass a vehicle?

• When you are in a no-passing zone
• When you are crossing or are within 100 feet of an intersection or railroad grade crossing
• When you are crossing on the shoulder of the highway either to the right or left
• All of the above
  Explanation:

  "You are not allowed to pass a vehicle when: 1) You're in a no-passing zone. 2) You are crossing or are within 100 feet of an intersection or railroad grade. 3) You are crossing on the shoulder of the highway either to the right or to the left."