What do traffic island markings across the intersection do?

• They guide drivers around a traffic island into separate traffic lanes to ensure a smooth flow of traffic.
  Explanation:

  "Traffic island markings across the intersection guide drivers around a traffic island into separate traffic lanes for a smooth flow of traffic."
• They indicate areas where vehicles can park temporarily.
• They mark zones where pedestrians have the right of way.
• They signal the presence of a school zone.