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

• The vehicle is in unsafe condition.
• The driver is in an impaired physical condition.
• There are hazardous conditions on the road surface.
• 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. Unsafe vehicle conditions. 2. Impaired physical condition. 3. Hazardous conditions on road surface."