When driving on the interstate, you should maintain a safe following distance of:

• At least 2 seconds in normal conditions and 4 seconds in adverse conditions
  Explanation:

  "When driving on interstates, maintain a safe following distance of at least two seconds behind vehicles in front of you. In adverse conditions such as bad weather, night driving, or on faster rural sections of the interstate, increase this gap to a minimum of four seconds."
• At least 4 seconds in all conditions
• At least 2 seconds in all conditions
• None of the above