What should you do if you find the fog is too dense to continue driving?

• You should move off the road and into a safe parking area
• You should switch to low-beam headlights
• Turn on your emergency flashers
• All of the above
  Explanation:

  "If the fog is too dense to continue, pull completely off the road and try to position your vehicle in a safe parking area. Turn on your emergency flashers, in addition to keeping on your low-beam headlights."