What should you do when encountering mobile work vehicles on the road with flashing amber lights?

• Speed up to pass them quickly.
• Maintain your speed and continuously sound your horn.
• Reduce your speed and follow any directions displayed by those vehicles.
  Explanation:

  "Mobile work vehicles usually operate at very slow speeds, such as 5 miles per hour, and may occasionally be stationary on the roadway. For your safety and the safety of others, slow down, yield the right-of-way to these work vehicles, and follow any directions displayed by them."
• None of the above.