How should you inform approaching drivers that there has been a collision and people are injured?

• Turn on the emergency flashers.
• Set up warning signals and flares.
• Ask someone to warn the approaching drivers.
• All of the above.
  Explanation:

  "You must turn on your emergency flashers to inform approaching drivers that there has been a collision and people are injured. This makes your vehicle more visible and alerts other drivers to the emergency. Additionally, set up warning signals and flares at a safe distance from the scene, and ask someone to warn approaching drivers."