Broken lines that are wider and closer together than regular broken lines are called continuity lines. When you see continuity lines on your left side, it generally means:

• The lane is ending or exiting soon.
  Explanation:

  "Continuity lines on your left indicate that the lane you are in will soon end or exit. You will need to change lanes if you want to continue in your current direction."
• It is unsafe to pass.
• It is safe to pass.
• None of the above.