Traffic Jam Puzzle

Two groups of 5 people are crossing a river in opposite directions by hopping on rocks. There are eleven rocks and in the starting configuration, the empty rock is in between the two groups:

Goal

The objective is for the two groups to exchange sides, that is, to pass each other, so all the members of each team are on their respective sides.

Rules

• You can only move forward in the direction you are facing. No backstepping or turning around.
• Only one person may move at a time.
• There are two kinds of legal moves:
  
  1. You may move into an adjacent empty space immediately in front of you.
  2. You may move around a person (or leapfrog over them) into an empty space behind them, if they are adjacent and FACING you.