Under good conditions, when driving behind any vehicle, at any speed, you should:

• A. Stay at least three seconds behind the vehicle in front of you.
  Explanation:

  "Staying three seconds or more behind the vehicle in front will give you time to react in an emergency. If the conditions are wet, then you should increase this distance."
• B. Drive as close to the vehicle in front as possible.
• C. Stay one second behind the vehicle in front of you.