Driving at or above the posted speed limit is more dangerous when:

• Weather is bad and visibility is poor
• Roads are slick or icy
• Tires are worn
• All of the above
  Explanation:

  "Excessive speed, even when conditions are ideal, is dangerous and increases the likelihood of an accident. Driving at the posted speed limit or in excess of it during the following roadway conditions is even more dangerous: 1. Bad weather and poor visibility. 2. Slick or icy roads. 3. Driving with worn tires."