Abstract: A simulator device for demonstrating the advantages of wearing a vehicle safety harness comprises a track and a seat connected to and moveable along the track. A dummy object comprising an egg is used to simulate a person seated in a vehicle. A safety harness is mounted to the seat and, in a first mode of operation of the device, harnesses the dummy object in the seat. A means is provided for propelling the seat forwardly along the track while a stop means limits the forward movement of the seat along the track. An impact shield is mounted at one end of the track for impacting the egg thereagainst in a second mode of operation. In the first mode of operation, the egg is harnessed on the seat to simulate the restraining effect of a safety harness on a person harnessed in a seat during a vehicle crash. In the second mode of operation, the egg is left unharnessed in the seat to simulate the impact effect on an unharnessed person involved in a vehicle crash.