Currently, there are two testing methods to evaluate the severity of pedestrian head injuries in collisions with cars. The first method uses a headform impactor to shoot at the test position and the second method uses a car to impact to a full pedestrian model. Both testing methods were tested at an impact speed of 40 km/h because statistics have shown that 40 km/h is the speed that causes the most serious injuries. In the headform impactor test, 40 km/h is the velocity of the head impacting the bonnet, while in the test with full pedestrian model, 40 km/h is the velocity of the car impacting the pedestrian legs. For the two test methods to be equivalent, in test with a full pedestrian model the velocity of the head part impact to bonnet must also be 40 km/h. In this study, the relationship between the vehicle velocity and the velocity of head part impacting the bonnet in test with a full pedestrian model will be investigated. Simulation method will be used in this study, to have a more solid basis to confirm the results in this study, simulation will be performed with three values of car velocity: 40, 32 and 25 km/h. The results of this study will be very useful in developing more accurate and reliable testing methods.