When should you increase the distance between your vehicle and the vehicle ahead?

• When you are being tailgated by another driver
  Explanation:

  "You must increase the following distance between your vehicle and the one ahead if another driver is tailgating you closely. It provides you with more time to react and brake safely in case of sudden stops or emergencies, reducing the risk of a rear-end collision."
• When you drive slower than the posted speed limit
• When you follow a motorcycle
• When you want to conserve fuel