Two water truck drivers were parked facing each other; one in each lane with approximately ten feet between them. The drivers were working on the victim's solenoid on the truck's upper water cannon. When they completed the task they both walked around their trucks to ensure the area was clear for travel. The victim went into a nearby porta-john, and the other driver climbed into the cab of his truck and started to drive away. The driver steered his truck to the right, away from the other truck to avoid hitting it as he drove forward and struck the porta-john that the victim was in.