What function do the emergency flashers serve in vehicles?

• They activate the airbags in case of a collision.
• They alert other drivers of a possible danger or a stopped/disabled vehicle.
  Explanation:

  "Vehicles are equipped with an emergency warning device that flashes all four turn signal lights. These flashers can be used as a warning by any vehicle to signal other drivers of a possible danger or that a vehicle is stopped or disabled."
• They adjust the brightness of the headlights.
• They control the temperature of the engine.