Which of the following vehicles are exempted from the HOV lane rules?

• Buses, regardless of the number of passengers
• Emergency vehicles such as police, fire, and ambulance
• Any vehicle carrying more than two passengers
• Both A & B
  Explanation:

  "Certain vehicles are exempt from the HOV lane rules. Buses can use an HOV lane at any time, regardless of the number of occupants. Emergency vehicles, such as police, fire, and ambulances, are exempt from the restrictions."