If while passing you feel the need to swing out across the center line to see oncoming traffic, it's a sign that:

• You are following too closely
• You are attempting to pass in an area where your sight distance is too limited to pass safely
• The way ahead is not clear
• Both A & B
  Explanation:

  "Swinging out across the center line for a look is not advised. If you need to do this to see, you are either following too closely or attempting to pass in an area where your sight distance is too limited to pass safely."