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

1. You can only move forward in the direction you are facing. No backstepping or turning around.
2. Only one person may move at a time.
3. 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.