Until 2002 the complete car fleet to be sold on the US market has to fulfill FMVSS201u (Free Motion Headform) legislation (DOT, 2000). It includes a test procedure using a free flying headform (FMH) that impacts several specified points on the upper car interior with a speed up to 24kph. Injury criterion is HIC(d), a modified HIC with a tolerance limit of 1000. The purpose of this paper is to give an idea if this legislation has potential to reduce head injuries, based on Finite-Element calculations.