Why should you use the “Dutch reach method” to open the door?

• It will let you shoulder check at the same time.
  Explanation:

  "Generally, a good practice to open the door is to use the Dutch reach method, meaning you open the driver’s door with your right hand as this will force a shoulder check at the same time."
• It will let you open your door wide.
• It will stop the traffic for you.
• None of these.