What is an emergency stopping lane?

• The portion of a primary highway that lies between the edge of the roadway and the first lane of travel.
  Explanation:

  "The portion of a primary highway that lies between the edge of the roadway and the first lane of travel, sometimes referred to as the shoulder, is for drivers who need to stop due to an urgent situation or because they have problems with their vehicle."
• The portion of a primary highway that lies between the edge of the roadway and the second lane of travel.
• The portion of a secondary highway that lies between the edge of the roadway and the first lane of travel.
• None of the above.