To drive safely on interstate highways, you should:

• Make frequent traffic checks by looking in your rear view and side-view mirrors
• Keep pace with traffic, but don’t speed illegally just because other drivers are speeding
• Be alert to merging traffic signs and vehicles entering the interstate
• All of the above
  Explanation:

  "Always remember these tips for safe interstate driving: 1) Make frequent traffic checks by looking in your rear-view and side-view mirrors often. 2) Keep pace with traffic, but don’t speed illegally just because other drivers are speeding. 3) Be alert to merging traffic signs and vehicles entering the interstate."